Need a vendor for copper foil sheet

I'm looking for sheets of copper foil.

Certainly we can find places to buy copper tape, I'm looking for something much wider, minimum around 5?x5?, ideally 8.5?x11'. I'm going to use an automated stencil cutter to prototype some antenna designs, so the copper should be thin enough to be easily cut with a razor blade.

If anybody can drop me a link of a vendor it would much appreciated.

Cheers,
Hemlock

http://www.shopaid.com/