Answer (1 of 4): Any US Post Office should have the "International Forever" stamps. However, auxiliary places that sell stamps are rarely likely to have those. Those international forever stamps are of course only good for the 1st ounce. If an envelope is heavier (and/or exceeds certain dimension
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Twenty (20) Global Forever Stamps (either one sheet of 20, or two sheets of 10) Global Forever stamp can be used to mail a one-ounce letter to any
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