I just replaced my rears(after 5500mi) from Discount Tire Co for $210 each. I don't know how much of a discount you can get with the NSXCA membership, but I needed to get the replacements asap and they had it in stock, which was amazing.
I just paid $240 per tire from a local dealer, plus $10 per tire for mounting and balancing. It seems to me that its not worth saving $15 per tire only to have to hassle someone to do the mounting and balancing.
[This message has been edited by dswartz (edited 27 February 2001).]
I just got my new yoko's last week. I called Bob at Discount Tire direct and he qouted me $132 and $167 (15/16). This was compared to Tire Rack's $163 and $205. Then he had the local discount tire store match his price and I didn't have to pay freight.
All I did was give him my NSX club membership # and he was very helpful. This savings alone more than justifies the membership fee.