I paid $117 for an aluminum OCR 3 frame this past fall. It came with the fork and a headset but no derailer. Without a fork I'd say no more than $100 if its less than 2 years old. You'll have to buy a fork and that would be $50 on eBay so take than into consideration. Personally, I wouldn't go more than $75 plus shipping if its aluminum, but I'm cheap.