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 postcards. First-Class Mail Forever ® stamps cost $0.66 (the current 1 oz price) and will never expire, even if the First-Class ™ postage rate goes up. To send packages, see the new USPS Ground Advantage ™ service. Buy Stamps First-Class Mail Prices Features & Pricing