The library does not sell postage stamps. All mailing services are located on the 1st floor of the Wilkinson Center in the University Post Office. See below:
UNIVERSITY POST OFFICE
1944 WSC (1st Floor of BYU Store)
Phone: 801 422 2085
Hours: M-F 9:00 am - 5:00 pm
Closed Tuesdays from 10:45 am to 12:00 pm for devotionals and on university holidays.