For US and Canada it's free.
For international backers it's tiered based on the reward. You should be able to see your shipping cost in the drop down menu on the reward.
The shipping fee paid in the checkout process is for the transportation of your purchase from our warehouse to your destination address. If your country charges import duties, taxes, or VAT, you will be responsible for these upon delivery. Backer is responsible for all duties and taxes associated with the import of the products into your destination country.