The Postal Service’s™ new First-Class Mail® single-piece 1-ounce price is 49-cents, effective at 12:01 a.m., Sunday, January 26, 2014. All Post Offices™, postal retail units, and Stamp by Mail fulfillment centers must increase the value of each Forever® Stamp on hand in their inventories prior to opening for business on January 26, 2014. All Forever Stamps on hand must be revaluated to the new First-Class Mail single-piece 1-ounce price of 49-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 January 26, 2014, with the old First-Class Mail single-piece 1-ounce price, accept the order with the old price and process the transaction as follows:
Note: Do not process Stamps by Mail Forever Stamp orders that are mailed after January 26, 2014, with the old price; return the order and payment to the sender advising them of the new First-Class Mail single-piece 1-ounce price.
— Revenue and Field Accounting, Controller, 1-23-14