Barnes and Noble UND Bookstore sidewalk sale set for July 27 Barnes and Noble UND Bookstore will hold their annual sidewalk sale Thursday, July 27, from 9 a.m. to 5 p.m. There will be reduced bargain books, thousands of children's and adult titles, and up to 75 percent off selected UND and Fighting Sioux imprinted clothing and gifts. Hot off the grill hotdogs and burgers will be served from 11 a.m. to 1 p.m. -- Michelle Abernathey, general manager, Barnes & Noble at UND, 777-2103.