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How many stamps to send letter from USA to Canada?
If im mailing a 6x9 catalogue envelope to Canada (my SASE)..... what kind of stamps should I buy and how many should I put on? I know about IRC's but Im going to the USA this weekend and I think It will be easier for me to buy stamps there.

I just take mine to the local PO because you'll have to fill out a customs form anyway. Pay them based on the weight and they'll print it out and stick it on. No messing around with stamps.