It would help to know what area you are in.

Also, give this a quick look over. Its a little old, but worth a 5 min read.

http://ecmweb.com/mag/electric_maximizing_value_scrap/

Not sure if its worth anything, but the local scallys round my way stick cables on a bonfire - the plastic burns and you are left with the copper. Not very eco-friendly though!