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'Forever' stamps have the latest stamp price associated with them, so when you buy them you pay the latest price and when you use them they are worth the latest price, no matter when they were printed. Now when I say "buy them" I mean from the Post Office or another official site that sells stamps. If there is some third party seller (I have seen some on web sites), they may offer them for a different price. But as long as they are 'Forever' stamps, they will work no matter when you bought them or use them.