There are a lot of variables that determine what they are worth. What Horsepower, any attachments, how many hours. But it seams the biggest variable is location. In my area there are tons of them around so the value is pretty low. The best way to get an idea of what they are worth see what they are selling for in local ads, or see what they have sold for in your area on ebay where they were local pickup only.

Peter, owner of about 5 gravelys.