Free $1 in Amazon MP3 Credit w/ Purchase of Select Apps for Android – Including Free Apps!Purchase at least one qualifying app offered in the Amazon.com Appstore for Android in the webstore or on an Android device. Many free and paid apps qualify. After completing a qualifying purchase, you will receive an e-mail indicating that a $1 credit for Amazon MP3 music has been applied to your account automatically. The e-mail will also provide instructions on how to redeem your credit.