It depends on what brand paint you buy. You could get it cheaper or more expensive. I am using nason paint and keystone clear. Those are mid grade products.
Other things you need to paint a vehicle... tape, paper, body filler, hardner, reducer, thinner, spreaders, bondo board, sandpaper, da, compressor, primer, primer gun, paint gun.... There is a ton of things involved for a quality job.
that stuff all adds up...a buddy of mine has been painting a 99 honda civic that was wrecked and I seen all the stuff he had to get just to paint it