Uses boto to retrieve current spot instance prices on Amazon EC2.
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.gitignore Initial commit Nov 6, 2014
LICENSE Initial commit Nov 6, 2014 Finalise ec2SpotPrices version 0.1. Mar 20, 2015


Uses boto to get spot instance prices and displays zones with the lowest latest price.

Daily, weekly, monthly and yearly cost estimates are given, assuming a number of instances to be spawned. Note that this does not take into account future price changes or fluctuations.

It requires a valid AWS key ID and secret access key, and it is suggested that users create a separate key set specially for this purpose.

A sqlite3 database is generated in-memory to compute the result.


Strategy involves finding lowest ever price across 6 months, then selecting regions/zones with the lowest latest price. (and is within 25% of lowest ever price)

The lowest latest price will never be lower than the lowest ever price across the past 6 months.


  • That 6 months of past data is sufficient
  • That 25% is a sufficient barrier to prevent sudden price spikes
  • Cost of EBS storage is not considered

Commandline Arguments

  -h, --help            show this help message and exit
  -instance-type INSTANCETYPE
                        Sets the EC2 instance type. Defaults to "r3.large".
  -os {linux,suselinux,windows}
                        Sets the operating system. Choose from
                        [linux|suselinux|windows]. Defaults to "linux".
  -profile PROFILE      AWS profile name in ".boto". Defaults to "laniakea".
  -spawn-num SPAWNNUM   Sets the hypothetical number of instances to be
                        spawned. Defaults to "1".