Very similar to some of the automated logic I needed to create for price tracking & prediction for my new startup www.happybuy.com. What I found was that the b

Very similar to some of the automated logic I needed to create for price tracking & prediction for my new startup www.happybuy.com. What I found was that the biggest savings list: http://www.happybuy.com/search//by-savings/ http://www.happybuy.com/search//by-savings/ Needs to be quite intelligent to filter out a lot of product noise. A lot of this is due to pricing manipulation whereby a price is low but the shipping is high. Also a lot of the products with the biggest savings aren't that useful :) We've managed to improve the value of the list but are constantly tweaking it to get a good balance of savings and useful products listed. Its especially important as we use a bot to auto-tweet the best saving of the day through twitter & facebook. Trying to get a bot to do this sometimes produces unintended (and often interesting) results.