Be careful, you end up sending Cds and swpacd refuses to give credit. I had mailed a CD with a USPS tracking number, they refused to give me credit even though it was delivered. I assume this is because they want you to purchase credits rather than earn them through actual swaps. So what you end up doing is paying for postage and giving the CD away for free. Who wants to throw money away like that. I am cancelling my account.