I, too am looking for information on a Murray Monterey 3-speed. It was bought during the 1970's. Front brake wire needs fixing, and the tires could be replaced, otherwise in good condition. All the parts are original. I tried to sell it at a garage sale last year for $10 but got no takers. I then realized that I might be shortchanging myself because the it might be considered vintage bike. I am still interested in selling it at a below the going rate by say 30-40%, but I don't know what the going rate might be. Any guidance on price would be appreciated.

Here's a link to see what it looks like:
http://www.bluekoi.com/garage_sale/3speed.htm