I hear you can buy Barq's root beer in glass bottles in Baton Rouge, LA. Any idea which grocery stores that carry it?

Sorry can't help you on location. I do know that the ones I picked up last spring in Missouri were quite tasty though...

I know for a fact you can buy Barq's root beer in glass at the Central Grocery Company located a few blocks away from the Cafe Du Monde in the French Quarter. Goes great with a Muffuletta.

If I'm not mistaken, I believe they are also sweetened with sugar. But I can't remember.