In last of April, 2013, in the Ft. Worth, Tx. area, bright No.1 copper went for $3.01 lb., No. 2 copper at $2.80 lb., and yellow brass was $2.05lb.
Use a copper penny made before 1980, shine it up on a wire wheel, and use it to color match to get your eye ready to know the difference in colors of copper, brass, and red brass. I took an old 100 grit sanding belt and spent very little time in making some old copper look shiny. It adds up in the end! Also, cut off the soldered pipe joints from longer pieces of copper tubing. Shine up the copper tubing and it will go for No.1 copper, and the pipe joints and solder goes for No. 2. Also, if you can find badly worn or scratched silver plated serving platters, take a minute to look on the back to see if it says: "Silver over Copper" Those old and cheap junk platters marked like that will sell for No. 2 copper! Just be sure to use a claw hammer to get the zinc decorative trim hacked off the edges.
If I find yellow brass decorative pieces or old imports from India of ashtrays and tall candle holders, for .50-cents up to $1.00, I learned the feel of a pound of brass, and I'll buy it at weekly garage sales. The scrap yard guys are either busy or don't care what you've got, so have it all separated out in cardboard boxes before you get there....
Including 8 stripped pair of OLD and long jumper cables I bought for $1 or $2, I sold and came home with almost $450.00 lump sum. It was a cost of under $100.00, but that cost was spread out over 6 or 8 months of weekly garage sales....