Here are some places to purchase thin copper:
Thin Metal Sales, Inc
15047 Sierra Bonita Lane
(34 ga copper) CDA 110 soft copper. 006x12" sold by the pound.
Industrial Metal Supply
(L.A Orange County, San Diego)
the have thin copper available in boxes called shim stock 6"x10".
Fax 800 533-6350
soft copper .006 x 6" or 12".
These sources were recommended by Trish McAleer. I took her workshop
in metal corrugation and came away with a tremendous amount of
Trish will give you a complete handout on all the
supplies she uses so you don't have to guess about what or where to
order supplies from for future projects.