canvas drop cloth without a seam in the middle?

I am looking for a canvas drop cloth without a seam in the middle. When I search for canvas drop cloths on the web, all the photos shown are in the packaging, and there's no clue if there's a seam in the middle or not. I am looking for the 9 x 12 size. Actually 6 x 12 would be fine too, but I haven't seen anyone with a 6 x 12 drop cloth.
Any ideas?
Mike...
Any ideas?
Mike...