Just a thought, but IMO if this is an ongoing job deal, I would scrap that stuff. If the electrician or even the foreman sees it up on CL, they might either get a little bit choked, or even think to themselves "Hey, why don't I just sell it myself to make some $$!". Another thing is that in my experience, selling any incomplete spools of wire has been pretty difficult, even with rolls that are near full, and most of those spools look like they're at less than 50%. There's always the question of how much wire is actually left. Plus lots of trades don't like to lay out $$ for materials till they actually need them for a job. Throw it up on CL, and I bet you get more calls on it from scrappers than from electricians.