Here are a bunch of schools with COAs <$25K total. http://talk.collegeconfidential.com/financial-aid-scholarships/1651944-very-low-cost-oos-coa-universities-less-than-25k-coa-for-everything-p1.html Some to consider:
http://college-tuition.startclass.com/l/2986/Minot-State-University $16K on campus
http://www.bemidjistate.edu/admissions/undergraduate/tuition-aid/ $17K on campus