When you buy a car, can you avoid buying through a bank and paying instead on your own?

=In other words, can I give a hefty down payment on a car and then pay the rest on my own, without going through a bank to finance the rest?

I'd like to give most of the payment in a form of a bank check, and then pay the remaining balance on my own. Am I able to do that, or do car dealerships require that you finance through them or a bank?

When you buy a car, can you avoid buying through a bank and paying instead on your own?
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