The powers that be here in MA won't let us serfs save the money on road taxes with off-road fuel. They need every nickel they can get their slimy hands on to continue their quest for world domination ... or destruction, more likely.
Only places you can find ethanol free fuel at any pump in MA is at an airport (100LL - $$$$), or a marina on the coast (also, $$$$). Most people just go to Home Depot, a hardware store, or an outdoor power equipment or powersports dealer, and buy canned fuel at $20 - $60 a gallon.
Cheaper to drive to NY, VT, or NH with a barrel.