First-Class Mail & Postage | USPSAlert: Some of our applications may be unavailable during routine maintenance from Saturday, May 11 through Sunday, May 12. We apologize for any inconvenience. First-Class Mail Mail in 1–5 Business Days First-Class Mail® service is an affordable and easy way to send envelopes and postcards. First-Class Mail Forever® stamps cost $0.68 (the current 1 oz price) and will never expire, even if the Firs
