Paypal funded from a bank account, wire transfer, money order; the usual eBay payment methods (or at least the old usual before eBay got all totalitarian and banned them in favour of PayPal).
If credit cards stopped working the economy would grind to a screaming halt though. I'd be more worried about the riots on the streets than how I was going to take an online payment for a t-shirt.
If credit cards stopped working the economy would grind to a screaming halt though. I'd be more worried about the riots on the streets than how I was going to take an online payment for a t-shirt.