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Namecheap.com: We say no to SOPA but only accept Visa and Mastercard, both of whom support SOPA.

They don't really have a choice about that.

They also gladly accept PayPal, to be fair.

And PayPal accepts Visa/MC - how far does the contagion spread?

I think Discover and American Express are not on the list.

There's not much after that except for BitCoins.