Home depot - Hardwood floor prep
FT MYERS, FLORIDA -- For a 130sf job that would be insane to use 20 bags. I am sure using a concrete grinder with dust free attachment in combination with a few bags of leveling mud would be fine. It still would result is additional labor from any flooring company. I would estimate floor prep would cost 375-700 for grinding and leveling a bad slab of that size.