Wikibuy - Find lower prices at other sellers while you shop on Amazon
CouponMate - Browser extension that automagically searches for coupons
Honey - Honey is a browser extension that automatically finds and applies coupon codes at checkout with a single click.
CouponFollow Cently - Coupons at Checkout is a browser plugin for Chrome, Firefox, Internet Explorer, and Safari that...
Dealhack - Dealhack: You Focus on Shopping, and We Focus on Your Savings
RetailMenot - The RetailMeNot mobile app allows you to find deals on the go for both online shopping and in store shopping.