The Cenex, which is located on 705 7th Street East in Starbuck, offers both E15 and E85 while the Minnoco in St Paul offers E15, E30 and E85. With these two stations on board, there are now 14 E15 stations in the state. Here are the list of stations that offer E15 (click on the station to get directions).
Chuck Spaeth Ford - Sleepy Eye
Holiday Stationstore #3506 - Plymouth