Or "Snowbirds" forum.
I know which one on Florida my cousin goes to, and why (a group of fellow bikers get together for the whole winter) but we've not discussed how much it costs. I'm sure there are other people who avoid this resort because of the bikers congregating there.
One of my own favorites is Cedar Oaks RV Resort in Grove, Oklahoma. Last time I checked it was under $500 a month for a winter stay, electricity not included. There is a winter clientele that looks not for warm, rather a survivable winter, and there a larger group spring and fall, as a stage in a slower migration that follows the seasons.
This year some of my Michigan - Florida friends went back when it got warm early, only to have to deal with late heavy snowfalls in May.