At Amazon, spend $25 or more on textbooks and receive a $5 Amazon MP3 Credit for free. (Eligible textbooks are sold by Amazon and will mention this credit offer under "Special Offers and Product Promotions" on the product page.) That's tied with a July mention of this exact deal and one of the best MP3 credit offers we've seen with these items from this merchant. The credit will expire March 2. Deal ends January 31.