I live in Denver Colorado and I am just now starting a search for semi permanent RV space. You can look up RV parks long term, ours here average 600 a month. but I have found individuals that will rent land for as little as $300 a month on craigslist.
Also Thousand Trails is offering $100 discount off of a year membership staying in their parks.
I will be looking for any other advice as I have not yet made my decision where to park my RV