Anna, I tried in the past with thicker cornmeal and didn't get a good result. I think it's a lot of pain.
I am sure you can buy somewhere. From google I got that some people were able to buy from Bulk Barn, I don't know if that helps. You might want to check also the indian aisle, I think most of the time what is called atta flour is a finely milled durum. But read the package carefully.
Edit to add: I'd also email Caputo and ask if they have a distributor in Canada and go from there.