Where can you find financing for a car loan if you are in a chapter 13 and have a letter from the bankruptcy court allowing you to incur debt in Georgia?

You don't need to finance while under bankruptcy. The BK 13 participant may make financial transactions with the permission of the bankruptcy trustee/court. It may prove difficult even with a letter of consent from the bankruptcy court, because any lender will be concerned about your overall financial status and whether or not the "13" will be completed. The best place to begin would be the banking institution where you hold an account. Be cautious of lender's who specifically target BK partitcipants, as they often use "predatory" lending methods.