Probably the stores in english canada mostly just sell english keyboards (after all you can change the keymapping in OS). Maybe it would be different in a city that is 50-50, but if you are in a city that is 90-10 english, probably not a lot of people are stocking french keyboards.
I have picked up a couple laptops with French Canadian layouts over the years and have encountered said layouts in French immersion schools, so I'm no stranger to them. That said, I'm not a French speaker, so I never looked into variations.
