www.royalmoore.com (bob lavrinovich)
www.usatoyotaparts.com
www.partznet.com
www.irontoad.com (a guy named Craig, i believe)
i've used the first 3 and heard good things about the 4th. generally, you will get better deals/discounts if you call and speak to someone rather than just going through their website. mention the mr2 board.