I have $3+ left over on my gift card that I just redeemed 10 minutes ago. When I try to purchase a $1.29 song, it says I need to enter credit card billing info. For the last 8 songs I just got, it didn't. I don't have a credit card, and I am pretty ticked that I can't use one fifth of the gift card I literally JUST bought. Is this common? I have tried to sign out and back in, but it won't let me spend the last 3 bucks.