Just in time for back-to-school. Get $5 in MP3s when you purchase $50 or more in qualifying new textbooks between 8/15 and 9/16 from Amazon.com. Just complete your Amazon MP3 purchase through Amazon 1-Click and the promotion credit will be automatically applied during the checkout process – no discount code required. This promotion does not apply to used textbooks, Kindle textbooks, or Kindle rentals. Limit one $5 promotional credit per customer.