I have two stations near where I work that sell unblended gasoline. This is an area that does not yet require blended gas as mandated in some areas by the EPA. I use this all the time. My fuel mileage suffers when I'm forced to get gas somewhere else that contains all that anti-pollution stuff.
Here is a list that was started on where to get pure gas:
Ethanol-free gas stations in the U.S. and Canada