Carolinas are a bit too far north unless you like frigid weather. Probable snow tho I'm no Carolina expert. Reasonable in Florida I assume means cheap and that implies north Florida (us 19/98/41 corridor and Ocala NF). BUT! near the Atlantic multiples the costs (which can be in the $1000-1500/mo range by factors of two or three. No good swimming beaches on the Gulf until you get to central FL. But there are many major springs, most in FL State Parks for swimming if the air temp is high enough. The ocean is too cold.
So as you can see the situation is more complex that you expected.
The major snowbird areas are Florida,The Rio Grande Valley (TX)_ and AZ south of Tucson. With other small areas scattered about,
There are long detailed threads here about this so you may way want to do so searches.
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