First-Class Mail & Postage | USPS
www.usps.com › ship › first-class-mailFirst-Class Mail ® service is an affordable and easy way to send envelopes and lightweight packages. First-Class Mail Forever ® stamps cost $0.58 (the current 1 oz price) and will never expire, even if the First-Class ™ postage rate goes up. For packages (up to 13 oz), prices start at $4.50. Buy Stamps First-Class Mail Prices