It's best to ask BEFORE buying.
Mostly as a courtesy to your seller, but also because with the recent introduction of the Global Shipping Program, a US seller may not be able to combine and discount shipping, even if she agrees.
Since you have already purchased, be aware that you have agreed to pay full price on shipping already. But go ahead and Contact the seller. Most will try to accomodate you.
Oh, and mention that First Class International by USPS handles up to four pounds of product and is Delivery Confirmed to Canada. Many US sellers are not aware of this recent change.
