here! When you are shopping online - all you have to do is go to ebates here and sign up, every time you shop go back to ebates and just find the store you want to shop at and click through it. The best part is you get $5 for signing up and then you would get your 20% from Old Navy. You get a check every quarter and I have mine deposited into my paypal for more shopping! I like to use it to buy coupons on ebay to make my house hold expenses less expensive.
I can't find when this expires though - so make sure you shop today!