How much $ for a Demon

Hey demon fanatic I just perchased a 72 340 demon off ebay for 3000.00 but the car needs both quarters replaced :sad2: . In the Mopar collectors guide I see these cars going for anywheres from 12000.00 - 20000.00. So I am sure these A bodys are the next mopars to come out of hibernation for the collectors that cant aford the high dollar E bodies and B bodies.