There are two sites that I really like to go through when making any online purchases: Ebates and ShopAtHome. I normally look at both of them before making a purchase, to see which is offering a higher percentage of cash back rewards. They really do operate exactly the same way. From the ebates site: Each store offers a different cash back percentage. Just look at the percentage next to the store name on the Ebates.com site to see how much savings you will earn.
Ebates is offering double cash back in December - so this is a great time to check them out!!! Click the above links to set up your free account and get started!