Sioux Shop offers 15 percent discount to U community Save some green when you buy your green (or white) at the Sioux Shop in the Ralph. UND faculty, staff and students receive 15 percent off all purchases all year when you present your UND ID. Open 10 a.m. to 6 p.m. Monday through Saturday, and Sundays from noon to 5 p.m. Always open at siouxshop.com. -- Traie Dockter, Fighting Sioux sports properties and REA marketing director.