What is an Elvis Presley 29 cent stamp worth?

Whether a stamp is of much value depends on several factors, such as how old it is and the sort of condition it is in. Of course, it can also depend on how much the buyer wants for the stamp!

A single stamp on it's own, which has been used (in other words, it has been postmarked and it's perforations damaged) isn't going to be worth much at all, perhaps less than face value.

If you have a sheet of such stamps, unmarked and unused, then they may be worth around twenty dollars, if they are of the more recent issue of Elvis stamps.

You can check stamp values for yourself in catalogues such as Scott's or Gibbon's, or online sites such as Delcampe.net.

Alternatively, you could take up stamp collecting yourself. This film takes you through some of the basics: