Why does the US Postal Service use costly materials to make stamps instead of cheaper alternatives? - Quora

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Did the U. S. postage stamps used to be used as currency? - Quora

Why is the U.S. Postal Service still important? - Quora

Is there a way to get mailing stamps at a reduced cost? - Quora

Do any of you collect items, such as stamps, coins, medals etc

What is the alternative to using postage stamps in the United

What does the red stamp on a two dollar bill mean? - Quora

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Why do we need stamps? - Quora