Wikibuy - Find lower prices at other sellers while you shop on Amazon
Gift Hero - The best wish list ever
Honey - Honey is a browser extension that automatically finds and applies coupon codes at checkout with a single click.
GiftBuster - Wish list registry & shopping list app
CouponFollow Cently - Coupons at Checkout is a browser plugin for Chrome, Firefox, Internet Explorer, and Safari that...
Giftwhale - Giftwhale allows you to create personalised wish lists online.