Where can I get a bad credit auto loan with a score of 550?

I have already tried one of the local dealers and they told me no yesterday. I have a car financed with Ford Credit right now and I am upside down on it because I deffered a few payments a while back. I want to trade it in, because it is starting to have problems and it is not worth me putting more money into it. I really do not want to go to a buy here pay here llot, because their cars are really over priced and they usually have motor issues too. Please let me know what you think. Thanks!