RetailMenot - The RetailMeNot mobile app allows you to find deals on the go for both online shopping and in store shopping.
link-o-mat - Cashback Portal - Verdiene mit linkomat Cashback - weltweit über 9500 Shops
ebates - Find thousands of coupons, promo codes and discounts.
Coupon Lawn - Coupon codes and promotional deals to popular online stores.
Groupon - Each day Groupon offers a deal through local vendors in your city.
Dealspotr - Dealspotr is like Wikipedia for deals.