For those in the Springs, I have always taken my stuff to Timberline Taxidermy on Victor Place/Frequent Flyer Point (This is the road you use to get to teh Harley stroe on Powers between Constitution & Palmer Park.
For hides, they prep them and ship them off out of state to be processed.
For mounts, they charge a bit more than others but I've always liked their work - much better than the work I've seen done by other places with my friends animals.
Now, I have another guy who does mounts but who is fairly new (just a few years) and is a Marine Reservist who lives near my off of Austin Bluffs (near Barnes). I have seen some of his work at Rocky Mountain Elk Foundation events and everything looks really good. His prices seem lower than most but he can't handle a lot of stuff like the bigger places can. When I get something else that I think should be mounted I think I'll try him. (PM if you want his info)