You might give Photoco on Donegani Ave on the West Island a try. I was there a week or so ago and managed to get a 30m roll of APX 100 for only $29. They have a website, too.
The other possible source would be Henry's in Toronto. They have an excellent stock of all sorts of film, but they are expensive. They also have a website.
I just noticed that for some reason the shipping to Canada is much cheaper if you buy from J&C through eBay than if you buy direct from their site. I just bought 5 efke 25 in 120 and shipping was a third of what they ask for.