Let's assume a farm has bought a 1000 gallons, and then supplies slow down. They still need that 1000 gallons to produce food to be sold to pay their bills. Why would they give you any of that fuel?
I could understand them selling you some untaxed diesel on the side now. They can buy plenty more, and they pay less because it is untaxed. Then they sell it to you for more than they pay, but less than the taxed diesel. As long as no one checks your tank and finds red diesel, you are fine.
But if supplies are low, and they are desperate, why would they GIVE you anything?
Wally, sometimes you think too much.