Most of the MN guys went over to MNSubaru.com. I'll post here anyways.
I get non-oxygenated (100% fuel) gasoline for the exact same price as standard 92 octane gasoline from the BP gas station I go to on 35W and county rd 10. I'm unsure about the quality of this fuel in the winter months though. There's a long list of non-oxygenated fuel in MN from the net made by the hot-rod guys here. Do a search on Google.