Current stock report.
SMALL CAVEAT: This is extracted from my own site in which I have added two custom fields to the Spree::Product class. Those being barcode and enabled. So this extension will probably not work out of the box for you. But you can fork it and remove references to those fields in the SpreeCurrentStockReport::Report class.
Add spree_current_stock_report to your Gemfile:
gem 'spree_current_stock_report', github: "Hates/spree_current_stock_report"Bundle your dependencies and run the installation generator:
bundle
bundle exec rails g spree_current_stock_report:install