Well i ended up getting a car from a dealership. But they told me that Ga does go by a list that is "supposedly" updated every 30 days. The list is a compiled average from KBB NADA and the Black Book dealerships use. There was one more thing they used for the list but i cant remember what it was called.

I forgot to asked whether or not it is available to the public, so maybe someone can find out later on. Once my tag and title crap is ready ill go to the tax office and ask more questions for you guys. If you have something you wanna ask just post it and I'll do my best to get you an answer.