RetailMenot - The RetailMeNot mobile app allows you to find deals on the go for both online shopping and in store shopping.
Rakuten - Feel the Joy of Cash Back. Find coupons and Cash Back in just 1 click with the Rakuten browser extension
Honey - Honey is a browser extension that automatically finds and applies coupon codes at checkout with a single click.
Dealspotr - Dealspotr is like Wikipedia for deals.
CoinRebates - Shop at your favorite online stores and earn Bitcoin cashback rewards on your purchases.
Groupon - Each day Groupon offers a deal through local vendors in your city.