In Texas they have antler/mount auctions in which the only thing they sell are mounts and horns. I went to one several years back and there were some serious buyers there. There were alot of guys from out of state who flew in for the auction. I dont know about your area, but I'm sure there are auctions like that up there. Or you could run an add in your newspaper and/or in the newspaper of the biggest city around your area.

I've also seen mounts at gun shows and Taxidermist studios down here that were selling whitetail mounts. The last 2 whitetail mounts that I saw each scored in the upper 170's, they had just been mounted that year by one of the best taxidermist in the state, and they each had a price tag off $7,500. That guy probably didnt get that, but I'm sure he got close to it.