Check Out 51 - Free grocery rebate app!!
I've been a part of their beta group for a few months, so I can tell you that this is an amazing program!!! They have just opened it up to new members. In order to use it you need their Apple App (Android coming soon)
Every week they release a list of products with a cashback amount. Just buy the product (limit 1), send them a pic of the receipt and they will send you a cheque.
Bonus: you can combine with any coupons or other offers, which means the potential for FREE STUFF!!!
Get the app here:
http://checkout51.com/app?p=ios
Check out their website for details and guidelines. Also click Current Offers at the bottom of the page to see the list:
http://checkout51.com/
Happy Shopping!!!