Adapters can be found for ~$15 US. Try Lik-sang.com for a pretty wide selection. Some of them can take 2 or even 4 PS pads at once, so if you're looking to play multi-player, that may end up being your best option. I have a USB pad that looks and feels just like a PS2 pad, and it ran me about $15 at EBGames. Don't know offhand who makes it, though.