Not sure who all this freebie is limited to, other than Android users.
Buy select free apps from the Android Amazon Appstore and receive a $1 MP3 credit on your Amazon account. Promotional offer is valid from June 6, 2012, through June 13, 2012, and subject to change. You must redeem the credit by July 31, 2012. Limited to one credit per customer.
(Take out any semicolons the forum might add to the link to get the link to work or any "amp" text).