PriceCute - Keep up with your competition's pricing on Amazon
Zoopla - Zoopla is a property website, focused on empowering users with the resources they need to make better-informed property decisions.
Camelcamelcamel - Easily monitor Amazon product prices and get alerts when they drop.
Offerwhere - Platform for advertising offers, and running loyalty programs online and in-store
Pricy - Amazon price watch
CouponScout - Get notified when your discount codes leak