A new set of Forever Stamps will be available in October. The 44-cent Forever stamps feature evergreen tree branches. Holiday Evergreen Forever Stamps are valid literally forever - despite any future postage price changes. The U.S. Postal Service promises no additional postage will ever be needed with the Forever Stamp. The U.S. Postal Service is planning to increase the price of a first-class-stamp by 2 cents to 46 cents effective January 2, 2011.