Here's the catch when it comes to online shopping in Canada, and its not the extra border fees.
It's selection.
As a Star Wars collector pretty much anything I would be seeking to buy online is only available from American dealers.
I don't know if its hard to find online Canadian retailers for other figure lines(G.I.Joe, Marvel, so on.), but Star Wars has gotten very difficult over the years.
My go to American site for Star Wars is
www.briantoys.com . I've been unable to find a Canadian site that carries much of anything since the Outerreaches scaled back it ordering years ago.
I've had awesome dealings with both Legends and A3U over the years, but Star Wars wise they just don't have the in demand items.