Amazon is offering $3 in credits towards MP3 downloads. This is the email they sent out:
As a valued Amazon Student member, we’d like to offer you a $3 credit good for music downloads from Amazon MP3.
Enter the promotional code STUDENT3 and redeem your $3 credit by following the instructions here . Your promotional credit applied to the purchase will be included in your purchase confirmation e-mail. This offer is good through 11/1.