Scott,
I suspect interested parties would want to know how many hours are on the machine, and also who the original owner was. The original owner is potentially significant because in terms of usage and maintenance/repair there's a world of difference between a utility company and a ski area (or other grooming organization).
I just checked and don't see it listed on ksl.com. Yes, I know they are SLC based, but it's a great place to advertise (free) a snowcat for sale. It gets viewership from quite a number of states. Generally people list snowcats in the "Recreational Vehicles section called Snowmobiles-used".
"Monster Jeff" (as I refer to him) has a 1974 Tucker 542A listed for $19,800. Yes, it has some shiny new paint and an extended cab, but pretty close to the same machine with wide steel tracks. I haven't seen either machine, but you might consider some refurbishment, and even with a healthy price increase you could be thousands under the other Tucker.
Good Luck!