I inquired of VP Racing Fuel about this (I was angling for the requirements to be a dealer, he wouldn't even tell me). They have a club purchase program. So if you're a member of a club and there's enough folks who want to buy fuel, you can get pallet-loads of fuel, delivered by truck. The hazmat fee will be around $40 (if I remember correctly), but that's for a pallet with a dozen cases of fuel.
I didn't pursue it farther than that, but if you're in a group that's big enough to make quantity buys, and if Powermaster fuel floats your boat, you may want to inquire.