Anywhere to Find Gas Without Ethanol?

Are there any places left (particularly in Southern Middle Tennessee) or national fuel brands that still carry ethanol free gasoline? I have come to find out that when I use ethanol free gas I get better gas mileage and better performance. My 350 engine is brand in new but is built for 75-85 vehicles and handles ethanol free gas better. I want to find some gas without ethanol. shoot....