A good website to get virtual Visa/MasterCard

I need to create a virtual(prepaid) debit card to make online purchases and pay for services online(amazon, heroku). I don't want to use my regular credit card and I don't want to get a card from any local bank. Is there a good website that allows you to do that? I've tried Entropay, but I can't load funds to that card from my credit card b/c of some bank to bank issues. Thanks.