New in the Biz

I am looking for a little help, I have been in the copper scrapping business for a few years now. Scrapping around 15,000 LB a year. Mostly all large cable that I strip by using a stripping machine. I just received a contract to handle 150,000 - 200,000 LB's a year. Some of this will be smaller gauge and I plan on purchasing a chopping machine.
The problem I have is I don't know who to sell my processed goods to. Does anyone have a list of brokers or refineries? Also is there any rule of thumb for what Bare Bright goes for under spot or futures value? Common ballpark % ? Thanks