NYCayman, if you're doing the DE or AutoCross events, the club will have some loaner helmets available if you don't want to make the $300 or more commitment to getting a Snell SA2005 rated helmet.
However, if you go the loaner route, I highly suggest you get a balaclava like this:
MOMO Professional Open Balaclava-Stable Energies
Basically a head sock to use with the loaner helmet. Trust me on this.

__________________
Pete
2008
Meteor Grey CS, PASM, Chrono, Sport Seats, Sport Shifter, Sport steering wheel, Xenon,
Fire Extinguisher, Auto Climate and clear bra!
2007
Blue Slate Infiniti G35s 6-speed