There's nothing that says you can't buy stuff on the ebay.com site. Shipping will be more, but you'll have a wider selection. I'm in the US, but own a British car, and I buy stuff for my car off ebay.co.uk all the time. Shipping costs more, but there's a better selection. If you have no credit cards, but do have a bank account you can set up a paypal account. Just about everyone on ebay accepts paypal payments.
-S