The problem for us from EU is that we either have expensive international shipping costs or we have to add the costs of the forwarding service to returning the item. That makes it often not worthwhile.
For example with MyUS you'd first need to buy pictures to check the color of the autograph ($2). For returning the item you pay $7 to handle the return (on top of shipping). But because you only want to send part of the original shipment back, you'd also pay the split shipment fee and that's an extra $15. So returning the extra CD costs you $24 plus shipping and that's more than the item price.