Are you comparing after only billed costs (tuition, fees, campus dorm room & board), or total costs, including books, miscellaneous, and travel costs that many colleges list?
If you are using the total costs, then check if there are ways to frugalize on them to save a few thousand dollars, since some colleges have very generous estimates for miscellaneous and travel costs (but some others do not).
If you are using only billed costs, remember that books, miscellaneous, and travel costs are more than $0 even for very frugal students.