How much does it cost to mail a 9x12 envelope in 2021? One dollar worth of Forever Stamps should be used for an envelope measuring 9*12 inches. On top of that, stamps equal to $0.01 must be paid for ...
you can still stick one on an envelope today and drop it into a mailbox. There are lots of places you can pick up stamps, not just at the local post office. If you're in need of postage ...