Welcome to the forum!
I presume you need a credit card or PayPal to pay Silvermans/CWC for the G10, is that correct?
If so, a silly question perhaps: Don't you have a Visa or Mastercard debit card? That should do just as well as a credit card. I would have thought that your bank would have issued you with one if you have a checking account and a steady job (such as being in the Navy!). Over here, most checking accounts (what we call current accounts) have a debit card attached.
It's also quite easy to open a PayPal account if you have a checking (current) account to back it.
Failing all that, it might be possible for someone here to buy the G10 for you and then ship it over. But of course you'd still need to send the money over and probably the cheapest and easiest way to do that would be via PayPal.