PriceCute - Keep up with your competition's pricing on Amazon
Giftwhale - Giftwhale allows you to create personalised wish lists online.
Mac Buyer's Guide - Recommendation on when to buy Apple products
Wantt - Create & share wish lists for free
Pricy - Amazon price watch
Anywish.app - Collect gift ideas for your loved ones and share your own wishlists. Add items from any online store. The perfect list maker for Christmas and other events!