Finding good faux fur here has gotten more and more difficult with every passing year. A few years ago when I was working on a film in Toronto an Assistant spent one very long day driving literally all over Southern Ontario trying to track down some specific types of fur. It can be very frustrating.
I'm not sure whereabouts in Canada you are, but if you are in (or can get to) Toronto, you'll find a lot of good faux fur along the fabric shop strip on Queen Street West (between Spadina Ave & Bathurst Street). Vancouver and Montreal have similar areas too. You can find really good stuff at Fabricland locations (especially in their sample bins, which often have fur they don't sell by the metre), but it's very hit and miss. Some stores carry a lot, some carry almost none at all.
Check out every fabric store you come across and speak to the staff. One shop in Toronto in particular has very little fur in their store, but a huge warehouse west of the city with a lot that is available by request. I have come across amazing materials just by befriending staff and asking a lot of questions (just be polite, not too pushy and spend a little money). It's always a good idea to ask how often they get new fur. As mentioned above, it's usually right before Halloween, but some stores will only get an order once every couple years.
If you have one or more Fabricland stores near you, it's worth going in once every month or two and having a quick look around to see if they have new stock. It won't always yield good results, but I've discovered some really great stuff that way over the years.
Another option worth considering is visiting thrift shops like Goodwill or The Salvation Army. You do have to be very careful because of things like bed bugs (I know someone who had to deal with bed bugs because of a thrift store purchase) but old rugs, coats and clothes can be a source of good material too.
Buy fur from the U.S. as a last resort because I'm pretty sure textiles are still protected goods under NAFTA and they get hit with a lot tax when they cross the border.