Price-Drop Refund Finder

The idea

I keep buying things online only to see the price drop a few days later, and most stores will refund the difference if you notice in time but nobody has time for that. I want a simple service that takes your order confirmation emails, watches the item's price for a few weeks, and files the price-adjustment claim for you when it drops. It would just need to handle the handful of major retailers that actually offer price matching to start.