For the first time in nearly 97 years, the price of a stamp is set to go down. On April 10, a first-class stamp will cost 47 cents, down from its current 49-cent price. The reduction is part of a pre-arranged agreement with Congress. The Post Office got to increase the price of stamps by 3 cents in 2014 to help it raise $4.6 billion in revenue. But the price hike was only set to last two years.