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At Amazon, get a free $2 Amazon App Store for Android Credit when you link your Twitter and Amazon accounts. (If you're not already signed in, you'll be prompted to do so. Afterward, you'll automatically tweet a message that will qualify you for the discount.) That's best credit deal we've seen for this service. Note that you will need to install the Amazon Android App Store App on your phone or tablet to redeem the credit. Credit expires December 15.