Honestly, you are not in a great position to ask for discounted tuition for many of the reasons stated upthread and others.
–These are all public universities for which your son is a nonresident (except Rutgers). Public universities (except for University of Michigan, which is financially flush but not on your list) are hurting, and state revenue will be greatly impacted going forward as a result of less tax revenue.
–He’s a transfer. In a business sense, their only incentive for having him come is his full out-of-state tuition. Freshmen have more leverage because they contribute to the school’s freshman yield, and a high-stat student will positively impact median scores.
–You didn’t complete FAFSA. As someone upthread said, they now know that you fully expected to pay full tuition and were not relying on a financial aid determination. Indeed, your full tuition might have been a factor in his acceptance.
–Even if you did complete FAFSA, out of state colleges (with few exceptions, such as University of Michigan) do not give need-based aid to out-of-state students.
–Ask, but don’t use the word “negotiation.” They will flat-out deny you.
On many levels I think Rutgers is his best option. It will cost the least to you, and it’s in a state that is doing everything humanly possible to combat the virus. Michigan is also a good state for the virus-prevention measures, but he’d have to fly there and it will cost a lot more. Ohio takes third place. SC, FL, IN, and TN? Not so much. It’s going to spin out of control there, and he’ll be taking classes online at home anyway.