If you are on the East Coast of the USA then Alro Steel is an excellent source, as for the Midwest and West coast I have no experience there. http://www.alro.com/
Here's a place that you might try: Printing companies that do embossed printing use brass or bronze plates. The plates are typically 1/4" or 5/16" When the printing job is finished, the plates are usually scrapped. If you check with some printers, you might be able to pick up the metal for scrap prices.
If you need the thicker cross section for better heat conductivity, you could stack two back to back and solder or epoxy them together.
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