What is the value of a 32 cal inline black powder made by marathon products?

There is one at Sol's Pawn Shop on 32 & L Streets in Omaha NE for sale at $89.00. It seems well enough made but the stock is Monte Carlo style and you cannot see the open sights due the stock being too high. It would require a scope added to the scope grooves on the action, or stock modification, to be able to sight at a target. It has been there 1-1/2 years now, nobody very interested. The price would be good if it didn't have that problem and some rust in the bore.