Amazon offers its Amazon Prime members a $1 MP3 credit
when you choose No-Rush shipping
in lieu of the usual 2-day shipping. (The credit will show in your account once your item ships.) It's the first such free credit we've seen solely for Amazon Prime members. Note that you'll need to choose a physical address; No-Rush shipping won't show up for P.O. Boxes.
Amazon Prime membership is $79 per year; however, Prime is free for college students for six months, and free for parents and caregivers for three months.