Sample Scott Numbers C40, C45 and C47. While most airmail stamps tend to be worth a bit more then regular issue stamps these are the most common and are valued at 15 or 20 cents mint or used, the minimum amount required to catalog and stock the stamps. Unused will always be worth at least their face value. Special cancellations and different values are likely to be worth more. Consult a postage stamp catalog, usually available at your local library for exact identification and catalog values.
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Go to the post office and buy "permanent" stamps. They have a "P" on the bottom right corner. To mail a letter, you only need one stamp.
3 cents
5 cents. Just kidding. They are not rare, about 50 to 60 cents mint condition UNCANCELLED. A cancelled Sam houston 5 cent about about 20 cents retail. yes, I was suprised too
This is a common US commemorative stamp. If you want to buy just one it will probably cost you from 10 to 25 cents at a stamp store. If you want to order it by mail, you would have to pay postage and handling in addition. Dealers get them as part of larger lots for almost nothing per stamp- say 65% face if mint and 1/2 cent if used. It is the kind of stamp I use on letters if unused or give to kids if used.
50 cents is worth more in the US.