Well it depends. In this area you truly get what you pay for. Typically costs are around $300-400. I have paid $700 and do not regret it one bit when compared to the ones I paid $300-400 for.
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ANNOY A LIBERAL, work hard and be happy.
Assuming you mean a shoulder mount, J3k2c1 was right about the average price. I'd go around to various taxidermists show rooms and check out their work. See what you like, and if it fits your budget, go for it.