Well, If it is indeed just for cooking, it is cheap enough at the warehouse clubs I wouldn't go to much effort to try to find an industrial source. Two gallons at my Sam's club is 3.58, making 55 gallons around $100. I can't imagine buying it bulk containers being much cheaper due in part to the cost of the drum. Plus, it's easier to handle, no need for a drum pump, there's no waste, everything is guaranteed to be food grade, etc.