Spree Simple Inventory extension
The Spree Simple Inventory extension adds a more comprehensive listing of products and their variants, with inline-table editing of prices and counts.
Add the following to your Gemfile gem 'spree_simple_inventory', :git => 'git://github.com/fabien/spree_simple_inventory.git'
To setup the asset pipeline includes and copy migrations run:
rails g spree_simple_inventory:install