BTW, most US sellers do not know that their customers will be charged a substantial fee by Pitney Bowes when they use the Global Shipping Program.
And of course, there is no chance that payable duty and taxes will be overlooked as they often (but not dependably) are by Canada Post.
If you are buying in the US, it would be a good idea, BEFORE BIDDING, to ask the seller if they use the program and if they are willing to bypass it.