RetailMenot - The RetailMeNot mobile app allows you to find deals on the go for both online shopping and in store shopping.
Savelist - Found products you want but not ready to buy?
DontPayFull - Verified coupons and discounts for a variety of online retailers.
Camelcamelcamel - Easily monitor Amazon product prices and get alerts when they drop.
Honey - Honey is a browser extension that automatically finds and applies coupon codes at checkout with a single click.
LoveSales - Find and save products you love, get alerted when they go on sale.