Slickdeals.net - Slickdeals: The Best Deals, Coupons & Discounts on everything
Honey - Honey is a browser extension that automatically finds and applies coupon codes at checkout with a single click.
BrickSeek - BrickSeek is a web application designed to help you buy those "Hard To Find" Lego Sets at...
Wikibuy - Find lower prices at other sellers while you shop on Amazon
CouponFollow Cently - Coupons at Checkout is a browser plugin for Chrome, Firefox, Internet Explorer, and Safari that...
Dealspotr - Dealspotr is like Wikipedia for deals.