The cost of mailing a letter is going up next week. The USPS will raise the cost of a Forever Stamp to 82 cents starting Sunday which was approved in May by the Postal Regulatory Commission. The commission, though, has concerns about the USPS. That's a four-cent increase. Other services will also see price jumps, including mailing postcards and international letters. The increases come after the USPS warned earlier this year that it could run out of money within a year. Last year, the agency lost $9-billion.