With tuition and fees totalling about $21,864 a year, the College of Business at Iowa State University was listed by U.S. News & World Report magazine as one of the least expensive public business schools for out-of-state students earning their M.B.A.s.  The rankings were based on tuition and required fees for the 2011-2012 school year. ISU's business school ranked No. 64 in the magazine's list of top business schools.