You can ship to Canada up to 4 pounds first class for $16.77, but it does not have tracking available, which pretty much kills the deal.
I pretty much don't advertise international selling and discriminate as to what countries I will ship to. I'm good with the UK, the Aussies, Kiwi's, and most of the upper half of Europe, otherwise, I steer clear.
The number one problem Ive had abroad, and this does not include Canada, it takes forever for Priority to get delivered. In the meantime, the buyer is asking me where their package is, like I got a spy camera complete with GPS tracking focused on it and I can give them an image complete with latitude and longitude as to its where abouts! How the hell am I supposed to know ?? Sure, at some point you might have to ask, I forward the tracking number the day it ships, I post it to their "won", but they still ask!
Anyhow, Ive found that certain cultures (you can call them countries, or races, I don't care) do have a clue, and to some extent understand how things work. Its taken better part of a decade to figure this out, and I can work with them, otherwise, I don't need the sale.
I have noticed the Canadians like GM parts for some reason. I even had a Chevy dealer email wanting to know how much for every listing on had on ebay at that moment ? It was over 100 random New GM parts listings.
So I go through the BS of standing in line to move more wares up north to Canada, and occasionally to other points, but I prefer not to do it, and thats only because of the Post office makes it that way! Yeah for post office service!