Unfortunately, Monarch Watch cannot ship live milkweed plants to Canada.

We have some Canadian plant vendors listed on our Milkweed Market page.
The Xerces Society also has an online tool for finding milkweed seeds, which may include Canada.

The Wallace Springs Eco-centre is doing seed collection and distribution. They are on Facebook.  

The David Suzuki Foundation is also working in the Toronto area to restore milkweeds, and could be a great resource.