If you want to buy geographically restricted books at Fictionwise and also get the rebates from those books take a look at
www.entropay.com.
The Entropay card is a virtual Visa debit card that has no registered billing address, so any address is accepted as a valid billing address.
I registered for a card yesterday and it was activated today.
I can confirm that the card does work at Fictionwise. You only have to change your Fictionwise country to US, and you can use your regelar address and name to pay with the Entropay card. The card is accepted without a problem.
This is of course just my personal experience.
Geert
The Netherlands