Do you have paypal? I'm pretty sure I've seen them offered on ebay.
I've seen the order forms at the vet's office, which you can mail in with a check. I think PetSmart stores also offer them.
Some of the websites that sell them seem to be small companies or individuals. You could probably email them and ask to mail in a check or money order with a handwritten order, and I'll bet you'll find one that is interested.