I was picking around at costs last night. For the Open class (What was displayed last weekend) are 500CC 2 or 4 strokes.

Indy Race Parts is carrying a QRC Roller for 5300. I went to the RFC Site and they offer a race ready brand new for 12.5k.

Upon a quick glance at a Nor Cal Outlaw Kart Facebook page, I saw a few used race ready between 65 and 8500.