I have seen them on Trader on line for 9,500 (old and hashed) to about 24,000 for almost new. Buyer beware, there are many junk ones floating around that need a lot of work. Repairs on one can run the cost to nearly new costs. A good used one is really a nice machine. I'd love a Maxi-sneaker, but would really like a mini because they are easier to get into back yards, transport, etc. Because of cost and a low budget I'll likely end up with a walk behind (like a Ditch Witch SX100) if I can find a good used one.
By the way, what did you decide to do on your tractor purchase?
Turfman