I just signed up with my credit card (US Bank checking Visa card) and just told the computer that my billing address was my mother's address in St. Louis, where it will be shipped. The actual billing address is in British Columbia, but the computer doesn't know that. I received my confirmation email and the money was withdrawn from my account.
Oh, and my mother will ship my DVD's to me when they come in.
So, if you know any American friends that will help you out, that's the way to do it!