I got the copper in a trade from someone, so I don't really know where it came from. I wish I did because I'm gonna need more after maybe 4 more knives. It's from a solid chunk about 3/8" thick or so by about 4" wide, and I just cut what I needed with the bandsaw. I pinned the bolsters on using ground wire from Lowe's. 11/64 i think it was, but they've got lots of sizes. All the barstock I've gotten has been from trades, so I'm as interested as you to find where i can get it for reasonable prices in thicker sizes.