The best-known discount dealers are listed on my web page below. I personally like Tallahasse Mitsu - best prices (call - phone quotes are lower than the prices on their web site) . There are also some used-parts shops that give discounts (see my Garage and Links pages), I don't know about the speed shops.
Puffe,
Mitsupartsdirect does give the 3si group a 25% dicount. You can get it by either calling them up or emailing them for a price quote! I also like Tallahassee, but I went with mitsupartsdirect w/ my last order because they give free shipping the first time you order from them.
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