Right now on Amazon if your purchase a subscription to Seventeen, Spin, Rolling Stones or Entertainment Weekly you will receive a $5 Amazon MP3 Credit for each subscription purchased.
So, if you purchase all 4 magazines you could end up with $20 in MP3 credit!
**Fine Print: Promotion runs through August 28th and is only available on the 1 Year Auto Renewal Subscriptions.
(Thanks Ruth)