RetailMeNot.com, Coupons.com and CouponCabin are popular sources for free coupon codes online. All three sites allow you to search for a coupon code from a specific site or browse a full list of the newest available offers.
RetailMeNot.com is the largest coupon code site for most online retailers and service providers, such as Amazon, Saks Fifth Avenue, Travelocity and Lowe's. Its coupon code search is designed for ease of use, allowing a user to simply type the name of the store she is looking for, then returning all the coupon codes available along with user ratings for whether the code still works.
Coupons.com is the most popular source for the type of coupons found in a Sunday newspaper. It has coupon codes for websites as well, but its selection is smaller. However, it has a huge variety of the kind of coupons for diapers, paper products and groceries that are typically printed and carried into a supermarket.
CouponCabin offers a list and search engine for coupon codes, similar to RetailMeNot.com and Coupons.com. However, it also offers a cashback program for users who shop with its affiliates. By using coupon codes offered on CouponCabin, users stand to earn around 5 to 10 percent cash back from purchases on average, which can then be used for further purchases with CouponCabin affiliates.