Listings online now are between $1,500 to $3,500.
Realistically I'm thinking a used 120 will be listed 1500 to 2500 (I don't know I may even still be on the low side. There are some high prices out there, at least with what their asking) for the one showing their design age but in good condition. I sold mine three years ago I think. I wish I would have kept it... Both the boys loved it! When I sold it, they were listing anywhere between $1,000 to $2,500... I sold it for $1,600 no haggling, I felt I could pass it on to another family to enjoy. We basically had it for 11 years and with the mods and maintenance I did I on it, I was right around breaking even. So I looked at it as great memories that really did not cost us anything...