If it is going to be a consistent source of material for you, I would talk to your scrapyard about this opportunity if the guy is taking his scrap elsewhere. If you go to the yard and tell them "I will be able to start bringing a few hundred pounds of copper per month but I need to make it worthwhile for this guy to not take it to the competition himself" they might quote you a better price than you are already getting to try and get the scrap coming to their yard. There is a lot of competition for material right now.