It depends on the frame chosen, some frame styles are available on the Canadian side (Toronto, Ontario I believe). I had begun a cheat-sheet of which frame-styles are available in Canada. I have had stuff come from the US and was always charged duty, thus I have a an alternate supplier that has all styles both on the Canadian/US side should I need to.
Once I see where it's shipping from, I'll edit the order/frame-style until I get a Canadian shipping. When that fails, I go to my alternate supplier. Too bad FAA can't get the suppliers to synchronize across the board...would make life so much easier...and I'm sure retain more business. I'd think that FAA would have a bit more clout by now in demanding this from their suppliers???
~Michel Soucy