RetailMenot - The RetailMeNot mobile app allows you to find deals on the go for both online shopping and in store shopping.

DontPayFull - Verified coupons and discounts for a variety of online retailers.

Groupon - Each day Groupon offers a deal through local vendors in your city.

Dealspotr - Dealspotr is like Wikipedia for deals.

Honey - Honey is a browser extension that automatically finds and applies coupon codes at checkout with a single click.

DealNews - DealNews is called to be the universe of sales because of featuring thousands of products in all ranges and categories from home to office products.