How do we figure out the net price for each school he has applied to?
I can help you with that. Finding out the net price for each school helps you figure out which one will be the most affordable for your son.
What if the school he applied to doesn't list the cost of attendance on his aid offer?
He can ask the financial aid office for this information. Be sure that it includes the amount he will pay to the school directly like tuition and fees, and other costs(living expenses, supplies, and transportation).