You have 5 to choose from
Tell us more about what you'd like to do, where you're coming from, and why you are interested in visiting CO in the first place, and you will get a lot more constructive advice on where you can travel and what CGs might be best.
Also, if you're truly a cheapskate, just go find NF or BLM land. Unless specifically marked otherwise, you can camp anywhere in there for free.
Every time you use an apostrophe to make a word plural, a puppy dies.
RV: 2018 Rockwood Mini Lite 2504S
TV: 2019 F-350 Lariat 4WD CCSB 6.7 PSD 3.55, 3,591 lb payload
Former RV: 2007 Fleetwood/Coleman Utah
Former TV: 2005 F-150 King Ranch 4WD SCrew 5.4L Tow Package