Skimming several threads (like one for homemade super pails and another with loads of links for ordering foods and other supplies in bulk) looks like interesting stuff for you rough country/military types.
Found them when googling “can humans eat oats for horses” when this one noticed a 50 lb bag is $15. (Spoiler alert: nope. Humans can’t eat hulled oats like animals can. And it’s dirtier etc. Damn.)