Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Paid cash for a car, but dealer wants to change price
Let me get this straight. I would stand my ground. Your son negotiated in good faith. Either they messed up, or they are dishonest. Either way your son wasn't the one supposed to know all the internal rules. I don't think it matters if they cashed the check or not. I would tell them if they have cashed it, that is even more evidence the deal was finalized. But even if they they didn't cash it, it only proves they are very disorganized. If for some reason your son feels forced to redo the deal, have him start the negotiations way below the price that was agreed to.  If the deal for some strange reason gets voided don't let him agree to some sort of restocking fee.