I have heard that Kosher Coke exists (the difference is that they use sucrose instead of high fructose corn syrup), but the only place I've ever heard people get it is in Atlanta.
I'm from Birmingham, AL, and I had a Jewish friend who would make trips to Atlanta and bring back cases of kosher Coke for a high school teacher who specifically requested it.
I hear it's good...I'd like to try some 🙂
Edit: Ah, Mongo beat me to the details 😀