If you have a military or DoD card you can stay at the FamCamp RV Park at the Air Force Academy. Stayed there several times, nice place for only $25 a night.
Mo Fred, U.S. Army Retired
2002 Beaver Patriot Thunder 40 FT, C12 CAT 455 HP
Towing 2019 Chevy Equinox, AWD Turbo Diesel