Some vendors will sell individual speakers others won't. You could always select a vendor who does.
It is possible to purchase a speaker from the US and have it sent to Canada (nice if you don't have to, but i have done this in the past).
You may end up having to buy two pairs, and have a spare. You could try convincing a friend to duplicate you effort and split the third pair (I did this with a friend, we each have 3 KEF iQ3 for our front 3).
What are your placement or size constraints?