Paribus - Find out for free if online stores owe you a refund!

Altosight - eCommerce price monitoring & tracking software

Lolli - Earn bitcoin when you shop online

Bidvoy - Bidvoy is an effective product value tracking service for eBay that is providing complete requirements as far as auctions are concerned.

ShadowBid - iOS App - A simple iOS app to automate saving money on Amazon

Auction Price Finder - Check the current value of any item on ebay, based on the last sales.