Id say anywhere from 100,000 on up for a 1500 hour machine thats 2 or 3 years old. I haven't priced one locally in a long time so thats just a guess. You might check on machinerytrader.com and look around. Theres probably several hundred 6s on there, and the state is listed if I remember right.
A 7 is not real popular around here for some reason. Most go for either a 6 or a 8,,, but I don't know why. Probably price difference if I was guessing.?