CSU Ft. Collins has some great programs and facilities, but even with WUE I think it would have a COA close to 29K (Actually, I just checked, and for fall 2015, with WUE, OOS COA is 33/32K.)
http://warnercnr.colostate.edu/geosciences-home
Their summer field camp is supposed to be outstanding academically and an absolute blast.