Painting it self, it if is a simple paint
job, should be doable for less than $200. I've done my 30' boat for that the last two time, including finishing today. Literally, a gallon of paint
at 100-200 a gal depending upon brand, a roller and paint
If you have to haul, you will have potentially another 300-400 max for the haul out and some yard time/fees too.
While it is out, you may need to replace some zincs if this boat has any, probably less than $20-30....I would swag you have none frankly. If you had an inboard, or an iron keel or other parts, then yes. I do not believe an S 24 has any of these.
If you are getting a haul out for the survey, assuming you are getting one, then reality is, all you may have for extra's is the day cost for the yard, and paint
etc when getting down.