The catalog doesn't show an Apollo 15 stamp being issued by the US. There are some generic Apollo stamps that might fit.
Most used US postage stamps are worth 15 or 20 cents, 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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$.44
1st class postage stamp at this time is .42. (as of May 2008)
44 cents
44 cents.
The price in 2006 was 39 cents, which is exactly what the stamp is still worth in 2016.