Hello I have a friend that has a couple of Caribou,Couse,Muley and Antelope mounts. Is there some place that may buy Mounts?

There are a few places, but very few. They really aren't worth a whole lot. They cost quite a bit to get mounted, but they don't retain that value. They are only worth something to the one who harvested them, unless they are Boone & Crockett status or were mounted by a world champion taxidermist.