99' kawasaki Mojave quad low in oil and it seized. what's the damage?

1999 Kawasaki Mojave 250cc ATV (Quad)
My son went riding on it for about 3 hours and parked it. he tried restarting it to load on the trailer but he wasn't able to kick start it. I tried to help him but I couldn't get it to turn over. I checked the oil level. it was practically dry.
What is the usual damage to this quad under these circumstances. Am I looking at top-end, bottom-end damage or both.
Any idea how much I'll be spending in parts?
Also where is a good place to order parts.