Amazon Local is offering a $3 MP3 voucher for the low, low cost of absolutely free. Follow this link, Amazon Local is just Amazon, so you'll have to sign into your Amazon account and you should be good to go.
If you're looking for something soundtrack-ey to blow your virtual $3 on allow me to point you towards Amazon's mini $3 soundtrack sale. Actually some good stuff there, I recommend the excellent Drive soundtrack.
Make it quick though, not sure how long the voucher will be available, or how long the soundtracks will be on sale.