Ever wanted to have an academic library of your own? This is your chance to start cheap as the University of Chicago's Regenstein Library sells hundreds of their old volumes for mere bucks a piece. From history to political science to South Asian studies and god knows what else, the sale runs through the entire summer so you'll have plenty of chances to pick up another copy of Marx. (The U of C-inclined can never have too much Marx.) Monday-Friday, 9am-12:30pm and 1:30pm-4:45pm.