One of our local yards here doesn't take low grade boards at all (Admiral). The other one I deal with (GLE) calls them "breakage" and last time paid 17 cents/lb, which seemed more than fair. They also accept as "breakage" clipped off wiring connectors, 110v plugs, etc.
Unfortunately, they only paid $1/lb for the high grade boards I had. I've been advertising and searching, but have not been able to come up with much of anything in the way of scrapped computers for a couple of months now, and was sitting on 15 lbs of motherboards that needed to get out of my garage. Didn't seem worthwhile to ship 'em.
Been starting to see lots more steel curbside lately, the weather seems to be taking the competition out of the picture.