Take a look at the freebie being promoted by ReceiptPal. This is a great new app that offers up gift cards when you upload receipts. The biggest difference between this app and all the others is that you can use any receipt to score points.
This means that any time you buy anything you can build up points for gift cards from companies like: Amazon, Visa, Walmart, Target, Home Depot, Lowes, and many others.
You can try it out for yourself by downloading their free app for Android or iOS.