I don't know if you had it done, but $500 seems way too cheap.
In regards to spray: You can spray thicker with a spray wand than with squeegee if you let yourself. It just depends on the operator and the mix.
Always beware of very uncalculated even numbers. I rarely quote a job that comes out to even #'s, usually after you do the math, tax, etc it comes out to a random number.