$200 - $350, depending on condition and butt style (round or square) and the need of the next buyer to have one.
The last one I bought cost me $250, but it was really tricked out, had a wonderful trigger with trigger stop installed, chamfered cyclinder, bobbed hammer, and was super accurate. It also came with a good IWB holster. (It was 3", with square butt. The round butts are a little more sought-after for CCW use, but don't always get more money.)