Amazon: Download Free Android Apps = $1 MP3 Credit
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Now through December 31st, 2015, whenever you purchase a qualifying Android app offered in the Amazon Appstore, you’ll score a FREE $1 MP3 credit! Even sweeter, many of the apps are FREE and have great reviews! Please note, there is a limit of one free credit per customer and you must redeem the credit by January 31, 2016.