Florida is a big snowbird area, so monthly stays need to be planned year in advance. Unless you wish to stay during the summer. Then you can try some of the local RV resorts.
You used the term "reasonable" and "Orlando" they typically dont co-exist.
My only guess would be one of the resorts around the 192/27 area to the West of WDW. Sorry I dont have any specific names, I believe some of these sites are privately owned but its common for the owners to rent them.
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