Here you can get 3 yards for $50, and from their order page it looks like they ship to Canada. Pretty sure it's similar if not the same stuff, nylon with very thin rubber backing. It's perfect for bellows.
A few months ago I bought some camera parts--some levels--from J. B. and Susan Harlin. Excellent service and very quick shipping. They were very easy to deal with, so you might email and ask about Canadian shipping.