Here in Largo, Fl. I have a friend who has a '80's 31' that she would sell for about $17,000 or less. It's in great shape at first glance. I have never looked at it as a purchase (like what's really wrong with it). When I was looking I found a really nice '80's I think a 33' for $10,000. Too much trailer for me to handle so I took a pass.
I agree with the others, take a pass and keep looking.