Where can i get copper tape in Toronto?

I'm planning on shielding a guitar. I copper tape, fairly thin, and hopefully with conductive adhesive. I have called a slew of stores to no avail (i.e., home hardware, lowes, home depot, rona, canadian tire, etc). Could you tell me where in Toronto I can find copper tape? If not I'll have to order it off of ebay from some obscure location. Thanks!