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It is not in the GTA, however you might want to look at the following web site. www.lindalock.com
Linda sells tin panels on her website for decorative painters, but they may be just what you're looking for.
Good Luck
Regards
May
I would call The Door Store in Toronto. I don't know for sure if they carry these, but it's worth the call!
416-863-1590
I'm not sure about sources around T.O. or on the web, but my mother obtained alot of them for free when they were tearing down an old building close to our house. They were under the existing ceiling.. Just a thought that maybe you could check out old salvage/second hand shops that deal with interior elements :) She did a paint finish on them and installed them as a backsplash.. Hope it helps..