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I am trying to figure out what kind of stamps to buy for Canada to US. I will have 9x12 envelope with the max weight being 2.5 ounces 50g to 100g. I saw on the canada post is should cost $2.10 ($2 in postage, .10 in tax).

My question is: Do I buy the international US stamps (flower) that are $1 a piece affix two of them, where do I get the .10 stamp from?

Thanks for any help!

It's just $2.

The tax is from ordering off Canada Post's site.

Thanks appreciate the help!