Ever since I discovered Subways never ending $6 footlong promocodes (always something like FL599, 599FTL, FOOTLONG599), I wondered if tracking grocery sales would be beneficial. As Kroger has a free API for prices, I setup these pages to download the weekly prices and create a personalizes sales tracker. While I don't expect to save enough money to make up for the time on this project, I might find similar applications in the future.
This page lists scores (current_price/mean(all_prices)) for all items in my watchlist.
This page adds next products to the watchlist.