Mostly, we buy online. Randy (becauseican) is local, and his parts are fantastic... Greg (cooleze) is also, but a bit further out in the valley, I don't think I've actually met him in person.
Mopac carries some bits, ST lowering springs, ARP hardware, this kind of stuff, and I'm sure they'll ship.
Other than that, I usually buy from Horsepower Freaks down in Oregon and have it shipped USPS up to me. Avoid UPS shipping no matter what you do - it's cheaper to get stuff sent FedEx than it is to pay for UPS shipping, duty, and brokerage.
