stationer (n.)

"book-dealer, seller of books and paper," early 14c. (late 13c. as a surname), from Medieval Latin stationarius "tradesman who sells from a station or shop," noun use of Latin stationarius (see stationary). Roving peddlers were the norm in the Middle Ages; sellers with a fixed location often were bookshops licensed by universities; hence the word acquired a more specific sense than its etymological one.