I don't know much of anything about this website, I'm just beginning to sift through the information included. The methodology section would seem to be required reading as the rankings do not seem to be directly related to cost. In any case, here it is: Cheapest Online Colleges & Universities for 2015
I thought University of Wyoming dramatically increased its online tuition??? I recall it being discussed on this forum a couple of years ago. This list has it ranked #1.
The tuition ranking does not make any sense. University of Florida charges $115.00 per credit for instate but no the entire online populations.
Indeed, and that's a subset of the general problem with rankings, that they necessarily assume that all people find every aspect of schools important to the same extents.