The Motorola Backflip is available for FREE at Walmart with a 2-yr contract (new or renewal). At AT&T stores, it's $99 after $100 mail-in-rebate. It's a really nice phone. Full keyboard, backtrack function and camera work very well. Plenty of apps in the Android Market.
Make sure that if you are wanting a renewal you have at least 22 months completed on your contract. I tried to do an early upgrade because I am eligible through AT&T but Wal-mart stores can't do it until 22 months.