As announced earlier this year, the U.S. Postal Service will be raising the cost of a Forever Stamp on July 9 by 3 cents from 63 to 66 cents. The USPS explained this was meant to “offset the rise in inflation.” The cost of sending a domestic postcard will increase from 48 cents to 51 cents, and a 1-ounce letter mailed outside of the US will be $1.50, up from $1.45 earlier this year.