Effective at 12:01 a.m., Sunday, April 10, 2016, the new First-Class Mail® single-piece 1-ounce price is 47 cents. All Post Offices™, postal retail units, and Stamp by Mail® fulfillment centers must decrease the value of each Forever® stamp on hand in their inventories prior to opening for business on April 10, 2016. All Forever First-Class Mail single- piece 1-ounce stamps on hand must be revaluated to the new First-Class Mail price of 47 cents each.
The new First-Class Mail single-piece 1-ounce price may affect Stamps by Mail Forever stamp orders that are in transit. If a Stamps by Mail Forever stamp order is mailed (postmarked) or the order form and check are dated before April 10, 2016, with the old First-Class Mail single-piece 1-ounce price, accept the order with the old price and process the transaction as shown in the table.
Note: Do not process Stamps by Mail Forever stamp orders that are mailed after April 10, 2016, with the old price; return the order and payment to the sender advising of the new First-Class Mail single-piece 1-ounce price.
— Revenue and Field Accounting,
Controller, 3-31-16