If CO wants business from us expats, then it darned sure ought to have our countries listed so we can enter our credit card details!

Paypal for some reason will not allow you to use AmEx to buy plane tickets. I despise Paypal and only list one card with them, which happens to be Amex and I am NOT going to list any other, and CERTAINLY NOT a bank account!
see www.paypalsucks.com So that is not a workaround for me.