You guys never heard of a replica mount?
I caught a 42 inch pike last year and called around for mount price. yes, I let the fish go.. I called for a replica. Anyways, 20$ a inch is the average price. From what I found out in my research I wouldn't pay less than about 20$ a inch, or you will risk getting a bad mount that you might not want to even hang on the wall.
There is a REALLY nice taxidermist in ontario that I found and called. It is cheaper for me to get him to do a really nice replica and ship it to me in lac la biche that to get someoen from this area to do the same thing.
the web site is
http://www.advancedtaxidermy.com/ ..
to answer your question.. about 20$ an inch