It's $100 and you get 2 20 minute sessions. There's also a SCCA race that weekend so the paddock should be full of interesting stuff.
http://www.motorsportreg.com/index.cfm/event/event.advert/uidEvent/5B5D3110-A861-FB00-3113CECEB4EFB01E
http://www.motorsportreg.com/index.cfm/event/event.advert/uidEvent/5B5D3110-A861-FB00-3113CECEB4EFB01E