Leaf has some inexpensive suits. They only charge $150 upgrade for custom tailoring.

Don't skimp on the protection your suit offers, SFI 3.2A/5 is a good choice, just make sure you spend a few bucks on carbon-X or Nomex underwear as well. Flames and heat don't know and don't care that you were just out to have fun. Last I heard they can't read labels either.