Head to the post office if you want to save your pennies!
The price of stamps goes up one cent -- to 42-cents -- May 12th. Other prices also go up.
The U.S. Postal Service reminds you that you can get around the standard stamp increase by buying forever stamps. Pay the current rate, 41-cents, and the stamps are good forever. They'll only be sold, though, until the May 12th price hike.