Last May the Postal Service designated 3,100 of its highest-revenue retail facilities as Premier Post Offices. They’re getting special treatment, like improved maintenance and extra training for retail associates. Last week the Postal Service released the Harry Potter stamps, but they were only available at Premier Post Offices. Now many of the Premier Post Offices are opening special hours. Five Premier P.O.s in Portland were open on Veterans’ Day, and forty of the 76 Premier P.O.s in North Carolina will extend their Saturday hours in December to handle the holiday rush. Read more.