diff --git a/package.json b/package.json
index f8610175..39b37b98 100644
--- a/package.json
+++ b/package.json
@@ -57,6 +57,7 @@
     "@istanbuljs/nyc-config-typescript": "^0.1.3",
     "@types/jest": "^24.0.18",
     "@types/node": "^12.7.5",
+    "@types/prettier": "^1.18.3",
     "@types/table": "^4.0.7",
     "@types/yargs": "^13.0.3",
     "@typescript-eslint/eslint-plugin": "^2.3.0",
diff --git a/src/ec2-types.ts b/src/ec2-types.ts
index 179f23f4..da3308b1 100644
--- a/src/ec2-types.ts
+++ b/src/ec2-types.ts
@@ -1,21 +1,9 @@
 export const instanceFamilies = [
   'a1',
-  'c1',
-  'c3',
-  'c4',
-  'c5',
-  'c5d',
-  'c5n',
-  'd2',
-  'f1',
-  'g2',
-  'g3',
-  'g3s',
-  'g4dn',
-  'h1',
-  'i2',
-  'i3',
-  'i3en',
+  't1',
+  't2',
+  't3',
+  't3a',
   'm1',
   'm2',
   'm3',
@@ -26,9 +14,12 @@ export const instanceFamilies = [
   'm5d',
   'm5dn',
   'm5n',
-  'p2',
-  'p3',
-  'p3dn',
+  'c1',
+  'c3',
+  'c4',
+  'c5',
+  'c5d',
+  'c5n',
   'r3',
   'r4',
   'r5',
@@ -37,290 +28,304 @@ export const instanceFamilies = [
   'r5d',
   'r5dn',
   'r5n',
-  't1',
-  't2',
-  't3',
-  't3a',
   'x1',
   'x1e',
   'z1d',
+  'd2',
+  'h1',
+  'i2',
+  'i3',
+  'i3en',
+  'f1',
+  'g2',
+  'g3',
+  'g3s',
+  'g4dn',
+  'p2',
+  'p3',
+  'p3dn',
 ] as const;
+
 export type InstanceFamily = typeof instanceFamilies[number];
+
 export const instanceSizes = [
-  '10xlarge',
-  '12xlarge',
-  '16xlarge',
-  '18xlarge',
-  '24xlarge',
+  'nano',
+  'micro',
+  'small',
+  'medium',
+  'large',
+  'xlarge',
   '2xlarge',
-  '32xlarge',
   '3xlarge',
   '4xlarge',
   '6xlarge',
   '8xlarge',
   '9xlarge',
-  'large',
-  'medium',
+  '10xlarge',
+  '12xlarge',
+  '16xlarge',
+  '18xlarge',
+  '24xlarge',
+  '32xlarge',
   'metal',
-  'micro',
-  'nano',
-  'small',
-  'xlarge',
 ] as const;
+
 export type InstanceSize = typeof instanceSizes[number];
+
 export const allInstances = [
+  'a1.medium',
+  'a1.large',
+  'a1.xlarge',
   'a1.2xlarge',
   'a1.4xlarge',
-  'a1.large',
-  'a1.medium',
   'a1.metal',
-  'a1.xlarge',
-  'c1.medium',
-  'c1.xlarge',
-  'c3.2xlarge',
-  'c3.4xlarge',
-  'c3.8xlarge',
-  'c3.large',
-  'c3.xlarge',
-  'c4.2xlarge',
-  'c4.4xlarge',
-  'c4.8xlarge',
-  'c4.large',
-  'c4.xlarge',
-  'c5.12xlarge',
-  'c5.18xlarge',
-  'c5.24xlarge',
-  'c5.2xlarge',
-  'c5.4xlarge',
-  'c5.9xlarge',
-  'c5.large',
-  'c5.metal',
-  'c5.xlarge',
-  'c5d.18xlarge',
-  'c5d.2xlarge',
-  'c5d.4xlarge',
-  'c5d.9xlarge',
-  'c5d.large',
-  'c5d.xlarge',
-  'c5n.18xlarge',
-  'c5n.2xlarge',
-  'c5n.4xlarge',
-  'c5n.9xlarge',
-  'c5n.large',
-  'c5n.metal',
-  'c5n.xlarge',
-  'd2.2xlarge',
-  'd2.4xlarge',
-  'd2.8xlarge',
-  'd2.xlarge',
-  'f1.16xlarge',
-  'f1.2xlarge',
-  'f1.4xlarge',
-  'g2.2xlarge',
-  'g2.8xlarge',
-  'g3.16xlarge',
-  'g3.4xlarge',
-  'g3.8xlarge',
-  'g3s.xlarge',
-  'g4dn.12xlarge',
-  'g4dn.16xlarge',
-  'g4dn.2xlarge',
-  'g4dn.4xlarge',
-  'g4dn.8xlarge',
-  'g4dn.xlarge',
-  'h1.16xlarge',
-  'h1.2xlarge',
-  'h1.4xlarge',
-  'h1.8xlarge',
-  'i2.2xlarge',
-  'i2.4xlarge',
-  'i2.8xlarge',
-  'i2.xlarge',
-  'i3.16xlarge',
-  'i3.2xlarge',
-  'i3.4xlarge',
-  'i3.8xlarge',
-  'i3.large',
-  'i3.metal',
-  'i3.xlarge',
-  'i3en.12xlarge',
-  'i3en.24xlarge',
-  'i3en.2xlarge',
-  'i3en.3xlarge',
-  'i3en.6xlarge',
-  'i3en.large',
-  'i3en.metal',
-  'i3en.xlarge',
-  'm1.large',
-  'm1.medium',
+  't1.micro',
+  't2.micro',
+  't2.small',
+  't2.medium',
+  't2.large',
+  't2.xlarge',
+  't2.2xlarge',
+  't3.nano',
+  't3.micro',
+  't3.small',
+  't3.medium',
+  't3.large',
+  't3.xlarge',
+  't3.2xlarge',
+  't3a.nano',
+  't3a.micro',
+  't3a.small',
+  't3a.medium',
+  't3a.large',
+  't3a.xlarge',
+  't3a.2xlarge',
   'm1.small',
+  'm1.medium',
+  'm1.large',
   'm1.xlarge',
+  'm2.xlarge',
   'm2.2xlarge',
   'm2.4xlarge',
-  'm2.xlarge',
-  'm3.2xlarge',
-  'm3.large',
   'm3.medium',
+  'm3.large',
   'm3.xlarge',
-  'm4.10xlarge',
-  'm4.16xlarge',
-  'm4.2xlarge',
-  'm4.4xlarge',
+  'm3.2xlarge',
   'm4.large',
   'm4.xlarge',
-  'm5.12xlarge',
-  'm5.16xlarge',
-  'm5.24xlarge',
+  'm4.2xlarge',
+  'm4.4xlarge',
+  'm4.10xlarge',
+  'm4.16xlarge',
+  'm5.large',
+  'm5.xlarge',
   'm5.2xlarge',
   'm5.4xlarge',
   'm5.8xlarge',
-  'm5.large',
+  'm5.12xlarge',
+  'm5.16xlarge',
+  'm5.24xlarge',
   'm5.metal',
-  'm5.xlarge',
-  'm5a.12xlarge',
-  'm5a.16xlarge',
-  'm5a.24xlarge',
+  'm5a.large',
+  'm5a.xlarge',
   'm5a.2xlarge',
   'm5a.4xlarge',
   'm5a.8xlarge',
-  'm5a.large',
-  'm5a.xlarge',
-  'm5ad.12xlarge',
-  'm5ad.16xlarge',
-  'm5ad.24xlarge',
+  'm5a.12xlarge',
+  'm5a.16xlarge',
+  'm5a.24xlarge',
+  'm5ad.large',
+  'm5ad.xlarge',
   'm5ad.2xlarge',
   'm5ad.4xlarge',
   'm5ad.8xlarge',
-  'm5ad.large',
-  'm5ad.xlarge',
-  'm5d.12xlarge',
-  'm5d.16xlarge',
-  'm5d.24xlarge',
+  'm5ad.12xlarge',
+  'm5ad.16xlarge',
+  'm5ad.24xlarge',
+  'm5d.large',
+  'm5d.xlarge',
   'm5d.2xlarge',
   'm5d.4xlarge',
   'm5d.8xlarge',
-  'm5d.large',
+  'm5d.12xlarge',
+  'm5d.16xlarge',
+  'm5d.24xlarge',
   'm5d.metal',
-  'm5d.xlarge',
-  'm5dn.12xlarge',
-  'm5dn.16xlarge',
-  'm5dn.24xlarge',
+  'm5dn.large',
+  'm5dn.xlarge',
   'm5dn.2xlarge',
   'm5dn.4xlarge',
   'm5dn.8xlarge',
-  'm5dn.large',
-  'm5dn.xlarge',
-  'm5n.12xlarge',
-  'm5n.16xlarge',
-  'm5n.24xlarge',
+  'm5dn.12xlarge',
+  'm5dn.16xlarge',
+  'm5dn.24xlarge',
+  'm5n.large',
+  'm5n.xlarge',
   'm5n.2xlarge',
   'm5n.4xlarge',
   'm5n.8xlarge',
-  'm5n.large',
-  'm5n.xlarge',
-  'p2.16xlarge',
-  'p2.8xlarge',
-  'p2.xlarge',
-  'p3.16xlarge',
-  'p3.2xlarge',
-  'p3.8xlarge',
-  'p3dn.24xlarge',
+  'm5n.12xlarge',
+  'm5n.16xlarge',
+  'm5n.24xlarge',
+  'c1.medium',
+  'c1.xlarge',
+  'c3.large',
+  'c3.xlarge',
+  'c3.2xlarge',
+  'c3.4xlarge',
+  'c3.8xlarge',
+  'c4.large',
+  'c4.xlarge',
+  'c4.2xlarge',
+  'c4.4xlarge',
+  'c4.8xlarge',
+  'c5.large',
+  'c5.xlarge',
+  'c5.2xlarge',
+  'c5.4xlarge',
+  'c5.9xlarge',
+  'c5.12xlarge',
+  'c5.18xlarge',
+  'c5.24xlarge',
+  'c5.metal',
+  'c5d.large',
+  'c5d.xlarge',
+  'c5d.2xlarge',
+  'c5d.4xlarge',
+  'c5d.9xlarge',
+  'c5d.18xlarge',
+  'c5n.large',
+  'c5n.xlarge',
+  'c5n.2xlarge',
+  'c5n.4xlarge',
+  'c5n.9xlarge',
+  'c5n.18xlarge',
+  'c5n.metal',
+  'r3.large',
+  'r3.xlarge',
   'r3.2xlarge',
   'r3.4xlarge',
   'r3.8xlarge',
-  'r3.large',
-  'r3.xlarge',
-  'r4.16xlarge',
+  'r4.large',
+  'r4.xlarge',
   'r4.2xlarge',
   'r4.4xlarge',
   'r4.8xlarge',
-  'r4.large',
-  'r4.xlarge',
-  'r5.12xlarge',
-  'r5.16xlarge',
-  'r5.24xlarge',
+  'r4.16xlarge',
+  'r5.large',
+  'r5.xlarge',
   'r5.2xlarge',
   'r5.4xlarge',
   'r5.8xlarge',
-  'r5.large',
+  'r5.12xlarge',
+  'r5.16xlarge',
+  'r5.24xlarge',
   'r5.metal',
-  'r5.xlarge',
-  'r5a.12xlarge',
-  'r5a.16xlarge',
-  'r5a.24xlarge',
+  'r5a.large',
+  'r5a.xlarge',
   'r5a.2xlarge',
   'r5a.4xlarge',
   'r5a.8xlarge',
-  'r5a.large',
-  'r5a.xlarge',
-  'r5ad.12xlarge',
-  'r5ad.16xlarge',
-  'r5ad.24xlarge',
+  'r5a.12xlarge',
+  'r5a.16xlarge',
+  'r5a.24xlarge',
+  'r5ad.large',
+  'r5ad.xlarge',
   'r5ad.2xlarge',
   'r5ad.4xlarge',
   'r5ad.8xlarge',
-  'r5ad.large',
-  'r5ad.xlarge',
-  'r5d.12xlarge',
-  'r5d.16xlarge',
-  'r5d.24xlarge',
+  'r5ad.12xlarge',
+  'r5ad.16xlarge',
+  'r5ad.24xlarge',
+  'r5d.large',
+  'r5d.xlarge',
   'r5d.2xlarge',
   'r5d.4xlarge',
   'r5d.8xlarge',
-  'r5d.large',
+  'r5d.12xlarge',
+  'r5d.16xlarge',
+  'r5d.24xlarge',
   'r5d.metal',
-  'r5d.xlarge',
-  'r5dn.12xlarge',
-  'r5dn.16xlarge',
-  'r5dn.24xlarge',
+  'r5dn.large',
+  'r5dn.xlarge',
   'r5dn.2xlarge',
   'r5dn.4xlarge',
   'r5dn.8xlarge',
-  'r5dn.large',
-  'r5dn.xlarge',
-  'r5n.12xlarge',
-  'r5n.16xlarge',
-  'r5n.24xlarge',
+  'r5dn.12xlarge',
+  'r5dn.16xlarge',
+  'r5dn.24xlarge',
+  'r5n.large',
+  'r5n.xlarge',
   'r5n.2xlarge',
   'r5n.4xlarge',
   'r5n.8xlarge',
-  'r5n.large',
-  'r5n.xlarge',
-  't1.micro',
-  't2.2xlarge',
-  't2.large',
-  't2.medium',
-  't2.micro',
-  't2.small',
-  't2.xlarge',
-  't3.2xlarge',
-  't3.large',
-  't3.medium',
-  't3.micro',
-  't3.nano',
-  't3.small',
-  't3.xlarge',
-  't3a.2xlarge',
-  't3a.large',
-  't3a.medium',
-  't3a.micro',
-  't3a.nano',
-  't3a.small',
-  't3a.xlarge',
+  'r5n.12xlarge',
+  'r5n.16xlarge',
+  'r5n.24xlarge',
   'x1.16xlarge',
   'x1.32xlarge',
-  'x1e.16xlarge',
+  'x1e.xlarge',
   'x1e.2xlarge',
-  'x1e.32xlarge',
   'x1e.4xlarge',
   'x1e.8xlarge',
-  'x1e.xlarge',
-  'z1d.12xlarge',
+  'x1e.16xlarge',
+  'x1e.32xlarge',
+  'z1d.large',
+  'z1d.xlarge',
   'z1d.2xlarge',
   'z1d.3xlarge',
   'z1d.6xlarge',
-  'z1d.large',
+  'z1d.12xlarge',
   'z1d.metal',
-  'z1d.xlarge',
+  'd2.xlarge',
+  'd2.2xlarge',
+  'd2.4xlarge',
+  'd2.8xlarge',
+  'h1.2xlarge',
+  'h1.4xlarge',
+  'h1.8xlarge',
+  'h1.16xlarge',
+  'i2.xlarge',
+  'i2.2xlarge',
+  'i2.4xlarge',
+  'i2.8xlarge',
+  'i3.large',
+  'i3.xlarge',
+  'i3.2xlarge',
+  'i3.4xlarge',
+  'i3.8xlarge',
+  'i3.16xlarge',
+  'i3.metal',
+  'i3en.large',
+  'i3en.xlarge',
+  'i3en.2xlarge',
+  'i3en.3xlarge',
+  'i3en.6xlarge',
+  'i3en.12xlarge',
+  'i3en.24xlarge',
+  'i3en.metal',
+  'f1.2xlarge',
+  'f1.4xlarge',
+  'f1.16xlarge',
+  'g2.2xlarge',
+  'g2.8xlarge',
+  'g3.4xlarge',
+  'g3.8xlarge',
+  'g3.16xlarge',
+  'g3s.xlarge',
+  'g4dn.xlarge',
+  'g4dn.2xlarge',
+  'g4dn.4xlarge',
+  'g4dn.8xlarge',
+  'g4dn.12xlarge',
+  'g4dn.16xlarge',
+  'p2.xlarge',
+  'p2.8xlarge',
+  'p2.16xlarge',
+  'p3.2xlarge',
+  'p3.8xlarge',
+  'p3.16xlarge',
+  'p3dn.24xlarge',
 ] as const;
+
 export type InstanceType = typeof allInstances[number];
diff --git a/util/generate-ec2-types.ts b/util/generate-ec2-types.ts
index 291fb76c..01646918 100644
--- a/util/generate-ec2-types.ts
+++ b/util/generate-ec2-types.ts
@@ -1,12 +1,100 @@
-import { spawn } from 'child_process';
 import { writeFileSync } from 'fs';
 import { resolve } from 'path';
+// eslint-disable-next-line import/no-extraneous-dependencies
+import * as prettier from 'prettier';
 
 import { getGlobalSpotPrices } from '../src/lib';
+import { defaultRegions } from '../src/regions';
+import { nockEndpoint } from '../test/test-utils';
 
-const targetPath = resolve(__dirname, '../src/ec2-types.ts');
+const familyGeneral = ['a', 't', 'm'];
+
+const familyCompute = ['c'];
+
+const familyMemory = ['r', 'x', 'z'];
+
+const familyStorage = ['d', 'h', 'i'];
+
+const familyAcceleratedComputing = ['f', 'g', 'p'];
+
+const familyOrder = [
+  ...familyGeneral,
+  ...familyCompute,
+  ...familyMemory,
+  ...familyStorage,
+  ...familyAcceleratedComputing,
+];
+
+const sizeOrder = [
+  'nano',
+  'micro',
+  'small',
+  'medium',
+  'large',
+  'xlarge',
+  '2xlarge',
+  '3xlarge',
+  '4xlarge',
+  '6xlarge',
+  '8xlarge',
+  '9xlarge',
+  '10xlarge',
+  '12xlarge',
+  '16xlarge',
+  '18xlarge',
+  '24xlarge',
+  '32xlarge',
+  'metal',
+];
+
+const sortFamilies = (f1: string, f2: string) => {
+  let rtn = 0;
+  if (f1[0] === f2[0]) {
+    if (f1 < f2) rtn = -1;
+    if (f1 > f2) rtn = 1;
+    return rtn;
+  }
+  const i1 = familyOrder.indexOf(f1[0]);
+  const i2 = familyOrder.indexOf(f2[0]);
+  if (i1 < 0) throw new Error(`unexpected instance family ${f1}`);
+  if (i2 < 0) throw new Error(`unexpected instance family ${f2}`);
+  if (i1 < i2) rtn = -1;
+  if (i1 > i2) rtn = 1;
+  return rtn;
+};
+
+const sortSizes = (s1: string, s2: string) => {
+  let rtn = 0;
+  const i1 = sizeOrder.indexOf(s1);
+  const i2 = sizeOrder.indexOf(s2);
+  if (i1 < 0) throw new Error(`unexpected instance size ${s1}`);
+  if (i2 < 0) throw new Error(`unexpected instance size ${s2}`);
+  if (i1 < i2) rtn = -1;
+  if (i1 > i2) rtn = 1;
+  return rtn;
+};
+
+const sortInstances = (i1: string, i2: string) => {
+  let rtn = 0;
+  const [f1, s1] = i1.split('.');
+  const [f2, s2] = i2.split('.');
+  let sc1 = sizeOrder.indexOf(s1);
+  let sc2 = sizeOrder.indexOf(s2);
+  if (f1[0] === f2[0]) {
+    if (f1 < f2) sc1 -= 100;
+    if (f1 > f2) sc1 += 100;
+  } else {
+    sc1 += familyOrder.indexOf(f1[0]) * 100;
+    sc2 += familyOrder.indexOf(f2[0]) * 100;
+  }
+  if (sc1 < sc2) rtn = -1;
+  if (sc1 > sc2) rtn = 1;
+  return rtn;
+};
+
+export const getEc2Types = async () => {
+  defaultRegions.forEach(region => nockEndpoint({ region })); // TEMP FOR TESTING
 
-const getEc2Types = async () => {
   const allInstances = (await getGlobalSpotPrices({ quiet: true })).reduce(
     (list, cur) => {
       if (cur.InstanceType && list.indexOf(cur.InstanceType) < 0) list.push(cur.InstanceType);
@@ -27,35 +115,32 @@ const getEc2Types = async () => {
     if (instanceSizes.indexOf(size) < 0) instanceSizes.push(size);
   });
 
-  // console.log(list);
   let output = '';
   output += `export const instanceFamilies = [ '${instanceFamilies
-    .sort()
-    .join("', '")}' ] as const;`;
-  output += `export type InstanceFamily = typeof instanceFamilies[number];`;
-  output += `export const instanceSizes = [ '${instanceSizes.sort().join("', '")}' ] as const;`;
-  output += `export type InstanceSize = typeof instanceSizes[number];`;
-  output += `export const allInstances = [ '${allInstances.sort().join("', '")}' ] as const;`;
+    .sort(sortFamilies)
+    .join("', '")}' ] as const;\n\n`;
+  output += `export type InstanceFamily = typeof instanceFamilies[number];\n\n`;
+  output += `export const instanceSizes = [ '${instanceSizes
+    .sort(sortSizes)
+    .join("', '")}' ] as const;\n\n`;
+  output += `export type InstanceSize = typeof instanceSizes[number];\n\n`;
+  output += `export const allInstances = [ '${allInstances
+    .sort(sortInstances)
+    .join("', '")}' ] as const;\n\n`;
   output += `export type InstanceType = typeof allInstances[number];`;
 
-  writeFileSync(targetPath, output);
-
-  await new Promise(res => {
-    console.log('prettier starting...');
-    const prettierPath = resolve(__dirname, '../node_modules/.bin/prettier');
-    const prettierArgs = [targetPath, '--write'];
-    const prettier = spawn(prettierPath, prettierArgs);
-    prettier.on('close', () => {
-      console.log('prettier complete');
-      res();
-    });
-    prettier.stderr.on('data', (data: Buffer) => {
-      console.log(data.toString());
-    });
-    prettier.stderr.on('data', (data: Buffer) => {
-      console.log('prettier error', data.toString());
-    });
+  output = prettier.format(output, {
+    printWidth: 100,
+    trailingComma: 'all',
+    singleQuote: true,
+    parser: 'typescript',
   });
+  return output;
 };
 
-getEc2Types();
+if (require.main && require.main.filename === module.filename) {
+  (async () => {
+    const targetPath = resolve(__dirname, '../src/ec2-types.ts');
+    writeFileSync(targetPath, await getEc2Types());
+  })();
+}
diff --git a/yarn.lock b/yarn.lock
index ff761c1d..b4bd5a6f 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -525,6 +525,11 @@
   resolved "https://registry.yarnpkg.com/@types/normalize-package-data/-/normalize-package-data-2.4.0.tgz#e486d0d97396d79beedd0a6e33f4534ff6b4973e"
   integrity sha512-f5j5b/Gf71L+dbqxIpQ4Z2WlmI/mPJ0fOkGGmFgtb6sAu97EPczzbS3/tJKxmcYDj55OX6ssqwDAWOHIYDRDGA==
 
+"@types/prettier@^1.18.3":
+  version "1.18.3"
+  resolved "https://registry.yarnpkg.com/@types/prettier/-/prettier-1.18.3.tgz#64ff53329ce16139f17c3db9d3e0487199972cd8"
+  integrity sha512-48rnerQdcZ26odp+HOvDGX8IcUkYOCuMc2BodWYTe956MqkHlOGAG4oFQ83cjZ0a4GAgj7mb4GUClxYd2Hlodg==
+
 "@types/semver@^6.0.1":
   version "6.0.2"
   resolved "https://registry.yarnpkg.com/@types/semver/-/semver-6.0.2.tgz#5e8b09f0e4af53034b1d0fb9977a277847836205"