Wyoming Flag to be Featured on U.S. Postage Stamp as part of the U.s. Postal Service’s “Flags of our Nation” series. Postal Service spokesman David Rupert says the flag stamps are being sold as a series, in a coil of 50 stamps only, priced at $22.50. The Wyoming Flag Stamp is part of the series and is not sold separately. Stamps will be available in local Post Offices on August 17. A dedication ceremony for the stamp will be held on Thursday August 23, at the Wyoming State Museum. The public is invited to attend the ceremony.