i also wanted to let everyone know this is an amazing deal, I had spoke with my machinist who gives me VERY good prices on all my heatsinks, and the price it was going to cost to have copper sinks made almost made me crap my pants (seriously, it was bad).
apparently machining copper is very difficult because it's so soft, so if your wanting a copper heatsink you should jump right on this.
As a very happy and proud owner of two lasers with these Copper h.s.'s in them, I can say the workmanship is flawless! Thanks Flamingpyro, these are the best heatsinked lasers I own! Also, a steal at $30 a piece IMHO! -Glenn