The Forever Stamp will always be available for purchase at the then-current first-class postage rate, and will be valid for use, well, forever, even if there have been subsequent rate increases.
The stamps are sold in books of 20, and there is no limit to the number of stamps that can be purchased at any time. While it is assumed that most consumers will now purchase the Forever Stamp, to ensure the stamps are still valid after the next postage rate increase, the postal service will continue to release commemorative stamps that have proven to be popular. Previous commemorative stamps include seasonal holiday stamps, stamps with flowers, landscapes, and those that commemorate famous people or events.
According the the USPS website, commemorative stamps to be released in May include those for the anniversary of the settlement of Jamestown, Virginia; the Florida Panther; Bighorn Sheep; and Star Wars.
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