Either go to a credit union or find dealers who have signs stating "buy here, pay here". Be careful though and do your homework. Some of these dealers sell cars with issues. Carfax is a good source but there are some dealers who will manipulate the carfax info. Interest rates on a loan vary from zero to whatever is allowed by law in your state. In GA, it's 29.99%.
I paid half cash for a car and financed the rest to see how it works. With zero % rate, I have to go to the dealer and pay every 15 days or they come pick up the car. The car was listed as a 2000 Honda Civic LX. It's a DX. I bought it "as-is" so I had to get the brakes done and buy new tires. If you are not a good negotiator, don't go alone. Google search the company before you buy from them.