Answer (1 of 12): A 1 oz. letter currently (March 2017) costs $1.15, which can be paid for as 1 Global Forever Stamp, or 3 Forever Stamps Domestic (retail value $1.47), or a postage paid label, or any number of stamps with face value of $1.15 or more. If your letter is more than 3–5 sheets of pap
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