Amazon: Free $2 MP3 Credit (Through 4/22) = Free Song Downloads

Through 11:59 PM PST on April 22nd, head on over here and enter the code
MOMROCKS to score a FREE $2 credit valid for any MP3 purchase in the Amazon MP3 store!

Also, be sure to check out the Bestsellers in MP3 page for a list of popular songs under $1.29 each, as you should be able to score a free song or two with this credit!
(Thanks Hip2Save!)