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How do I go about that?
):

You will need more than normal stamps on your envelope to Canada. You will also need an IRC or Canadian stamps for the sase.

BossC

You can buy stamps on the Canada Post website or call them. There is a specific stamp for mail to US. Figure out how many to put on your SASE based on weight(you may have to convert to grams to use their site). If you're putting cardboard in(I do) you'll need to take it into the PO, fill out a custom form and pay at the counter. Good luck.