What is my Kubota G1900S worth?

[turbotaguy]

I have a 93 or 94 (need to verify) Kubota G1900 diesel tractor that was given to me by a family member. I am considering selling it. What do you think it is worth? Where is the best place to list it?

Kubota G1900 4 wheel steering. Diesel 18hp. 60" deck. 420 hours. Runs and drives excellent. Reasonable condition (always stored inside, but scratched up from kicking around int he garage).

Thanks in advance.