Less then $300, I am thinking maybe in the $250 range?
According to wikipedia the P85 was discontinued in 1990, and the P85 MKII was discontinued in 1992.
A buddy of mine has a P85, and it is an outstanding pistol. It hangs right there with my Beretta 92f.
I would pay $250 for one, but when you get upwards between $300 - $400, you are getting close to buying a new pistol.