I just recently had a project at work where I had to recycle a large amount of metal at different locations around the country and learned a few things in the project. First, prices vary by region of the country, AND also by fluctuations in the metals market.
Copper and Aluminum are the most desired. Steel is the least desired. Copper needs to be bare wire or you get Steel prices. Steel needs to be unpainted or you get a reduced price. If you do not sort the metals, you get steel prices.
If you're lucky a recycler will give you about half of the current metal prices, most give about 1/3rd. I was recycling 600 pounds of Steel (including large solid metal plates,) 300 pounds of aluminum, and 100 pounds of copper at a time. In Chicago I made $40 total off that metal. In Salt Lake City I made $87. Portland, I made about $60 and in Florida I made $94.
Over all it's pretty much only worth your time if you've got a full pickup load. And a place to store that much metal in between trips. Otherwise I just let my brother take most of it, he's got a large piece of property and has the room. Even then he loads up his pickup truck and a large cargo trailer before taking it in.