Alternative for creditcard, at least in Europe:
Wirecard
It's an online wallet, kinda like Paypal; you transfer money to it, and then use the creditcard details they give you to make the payment online. Works anywhere they accept Mastercard. Can't go into debt since you can only spend what's in the wallet, which makes it fairly resistent to abuse as well: anyone who steals your details can at most access the spare change that's in there. It's part of or a division of a German bank, so not just some shady business.
Used it myself to order A-10C, worked like a charm. Took about 3 days for the transfer from my bank-account to the wallet, and then instant purchase in ED's shop.
1 thing though: they charge €1,- per transaction, but that's when you deposit money into it (and presumably if you transfer it back to your account, if that's possible, not sure). They don't charge extra on purchases though, so no matter how many transactions you make with the money in the account, it's all free to spend.