First place I'd try for copper is a roofer; they use it for flashing.
I'm not sure about the thickness.

On Fri, 13 Oct 2006 11:13:09 +0000, Scott
wrote:

For one of my different hobbies...does anybody have a good source for
brass or copper sheet? I'm thinking something around 0.025" or 0.032"
and two pieces that are about 30" X 30" or so each. Would I need to
take out a second mortgage to obtain pieces like that?

Scott