Head over to Amazon and ''purchase'' one of the free games to get your FREE $5 Amazon Credit! Simply opt to download one of the qualifying free apps. If you're not an Android user, you'll receive a warning but continue regardless what it says. You don't have to download the app to receive the free credit.
After doing so, add anything to your cart and when you go to checkout, your $5 credit will automatically be applied! This offer is valid through December 24th.