Deadwoodbuck,
Your going to find that the Prices you are looking for are going to be all over the board, depending on who you take it to. I don't even know what the Average is anymore for A Tanned Bison Hide with the Hair on. I charge $20 per sq/ft. I'm going to say your going to find prices between $16 and 25 sq/ft.
As far as a Mount goes for just a Standard Shoulder Mount I'm $1350 but your probably looking in the neighborhood around $1200-$2000 depending on who you take it to. Those are the Prices I have seen.