Ebates has online rebates and coupons for over 1,200 stores! This is one of those stores that you go through their link to whatever shopping site you choose and then you get cash back on your purchase. They also have coupon codes available on their site to help you spend less. They also offer specials where they double the cash back for certain stores.
They are free to join and they generally have a sign up bonus of $5 to $10 when you sign up. Go here for details.