Nyoka, you'll find quite a few on Cl and the biggest national site is
http://www.rvtraderonline.com/
I own several currently and have had several in the past. You need to ask yourself a couple of questions first.1. How long can I go? If you are going to any State parks, very few sites are over 30ft. If a friend's yard or on a city street, where will it fit. My 23ft is the love of my collection but it is very compact inside.
2. Will I have hookups? Showers are Navel and brief in an RV. There's not much on-board water or waste capacity. So if you want a long shower, you will need hookups. Also almost all RVs have a 6gal water heater. That's not much.
3. Battery power only goes so far. Can you run the genny or will you have shorepower?
4. Are you going to Burning Man? It's really dusty and you will NEVER get it all out of the RV. Plan on taping all your RV openings shut, except exhaust ports. And they will get filthy too.
The list goes on. IB me for more details or questions.