I have been asked about this a lot so I'm going to lower the price of shipping to all Canadians to only $10 USD. Simply do this:
1.Pledge at the amount you want and then subtract $10.
2. It will pop up in red saying you cannot do this because you are out of the USA.
3. At the bottom of the screen there will be a small link that says: "In the USA?" Click that, and it will allow it to go through.
So for example, if you pledge at the $35 amount(plus $20 shipping), simply subtract $10 from the $55 making it $45. Hope this helps.