Depends on the dealership I guess. Every car I buy is paid for in "cash", never was I allowed to pay in actual cash or personal check. I did the stacks of $100's once as well as a joke/bet with my buddy. The reaction was great, but they wouldn't take it. (This is in NY btw if that makes a difference)
Edit: I pay wire transfer now, that is cheaper than paying for a Bank Check or Money Order for large sums of money.
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