The manufacturer of these cars is Star race cars. Dealer link is
http://www.starmazda.com/dealers.htm
The main page is
http://www.starmazda.com/index.html
Other useful resources are the formula mazda forum
http://p211.ezboard.com/bformulamazdaforum
For formula fords/formula SCCA/formula 1000/ formula atlantic, the website is
http://www.apexspeed.com/forums/

If you have an interest in these cars, I'd suggest going to a local SCCA race to see what the local car counts are like. The key to having fun in these cars is having enough people to race. If you haven't driven an open wheeler or sports racer (ie CSR or DSR) you owe it to yourself to try one. They will make any street car feel like an Escalade.

 

Thanks!