Thank you for the suggestion of using a dealer with an online storefront. I have done that with Subaru and Toyota parts. I needed the reminder though..
Also, thanks for the Mazda Motorsports link.
Oddly enough, I had thought about autocrossing, but the Mazda is my wife's car. I may have to talk her into autocrossing and live vicariously through her.
Only thing is, she would have to be seriously interested in driving. I'm not sure she's made that way, but it would be interesting to find out...