If you don't mind a less than ideal grade of copper, then find it locally. I'm in Vancouver, Canada, which isn't exactly a manufacturing powerhouse, yet dozens of metalshops around here will give me odd bits at cost or nothing. There are scrapyards too, which seperate out the metal types of course, but they gouge. Just look around, or open your local business directory to "metals" etc.
If you must have the purest, cleanest copper plate, then follow the above links.
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