Pre-paid gift cards that work like credit cards, for example http://usa.visa.com/personal/cards/p...gift_card.html

Rather than having to order one from the internet and pay a fee there are other places that sell them, Simon malls is the first one that comes to mind since there is most likely one or more in every united state.
http://www.simon.com/giftcard/

These can then be used like credit cards to buy products such as Salvia from the internet.