RetailMenot - The RetailMeNot mobile app allows you to find deals on the go for both online shopping and in store shopping.
Wikibuy - Find lower prices at other sellers while you shop on Amazon
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.
idealo - Idealo is a free to use mobile application that helps you to find products, compare price and make an informed decision.
CouponFollow Cently - Coupons at Checkout is a browser plugin for Chrome, Firefox, Internet Explorer, and Safari that...