Does anyone know if the is a place in Atlanta that sells tomato seedlings for a Fall Crop?
No. Not any more. I used to carry them at a garden center where I worked. We grew short day length and cherry tomatoes for fall planting, making sure they were short season too. Because it is not common practice to grow fall tomatoes, most places just don't carry them. You can growing them yourself from seed, it's easy and you start now. Here is a nice list.