I'm no fan so I've done a little research. If a station sells non ethanol fuel it must have a sticker on the pump saying no ethanol, this is Missouri law. The only stations I know that sell it are the Signal stations in Springfield. The Conoco on Seminole and Glenstone and the station in Walnut Grove have signs saying so. I've only found it in premium. The Signal stores are 20 cents more per gallon versus regular, Walnut Grove is 30, Conoco don't know. I bring cans an fill them up so I have it when I need fuel. Little bit of a pain but I'm always in Springfield for something.
Hope this helps.