Amazon offers a free $5, $10, or $25 Amazon MP3 credit with the purchase of select electronics. Although we've seen free MP3 credits with no purchase necessary in the past from this merchant, it's still up to the largest free credit amount we've seen. Upon shipment of your purchase, you'll receive an email indicating that the MP3 credit has been added to your account. Deal ends August 31, and the MP3 credit expires September 30.