I looked on ebay and found this, which looks like an ok deal:
http://cgi.ebay.com/Copper-Flat-Bar-...1%7C240%3A1318
I've also tried calling a local scrap metal place but they never have anything. Anybody have a better place to look? Or cheaper? I want either some 1/2 thick or 1/4 thick and some 1/8 thick too. Thinking of watercooling my PSU, maybe some custom NB blocks too, try out my new drillpress