Camelcamelcamel - Easily monitor Amazon product prices and get alerts when they drop.
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!
Fetchee - Fetchee is a free price tracking wish list app that works with all online stores worldwide.
Gift Hero - The best wish list ever
Savelist - Found products you want but not ready to buy?
Giftwhale - Giftwhale allows you to create personalised wish lists online.