Most calls start with a garage floor that's stained, dusty or peeling where an old paint or sealer gave up. Polyaspartic is a good answer when you want something tougher than paint and can't spare the floor for long. It costs more than a basic epoxy, though, and it only holds as well as the concrete under it, which is why I look at the slab before I talk about colors.
The price turns on the size of the floor, the shape it's in, the product we use and any decorative finish you choose. A floor with old coating to strip, wide cracks or damp spots needs more prep, and that adds to both the cost and the schedule. Your written estimate puts the price and the prep for your own slab on paper before we start.