Amazon's Android Appstore has the "Stack the Countries" app free today:
http://www.amazon.com/mobile-apps/b/ref=nav_sap_mas_generic?ie=U... (Regular $1.99).
After I got it, I received an email from
Amazon for $1 MP3 credit:
Amazon said: Thank you for purchasing from Amazon.com.
Your recent order [EDIT]entitles you to a promotional credit which we have added to your account. This credit can be applied to your next qualifying purchase.
Promotion details:
Additional information on this offer can be found here.
As a purchaser of a select app from the Amazon Appstore for Android you have earned a $1 credit valid towards Amazon MP3 albums or single songs at http://www.amazon.com/mp3. Limit one promotional credit per customer. For redemption instructions and additional information, click here http://www.amazon.com/mp3redeem. Amazon MP3 music is available to customers located in and with billing addresses in the United States. Taxes apply in some states. Your credit expires at 11:59 PM PST on January 31, 2015.
The promotional credit must be used by January 31, 2015. This offer is subject to Terms and Conditions.