What is your price limit?
Texas - Permian Basin appears to be relatively inexpensive:
http://www.utpb.edu/services/business-affairs/accounting/cost-of-college/cost-of-attendance (scroll down to get to fall 2015 instead of summer 2015)
Alaska - Fairbanks, Wyoming, New Mexico Tech, and Montana Tech are also relatively lower priced for out-of-state students.