Try finding small pistol primers. I made the mistake of letting myself get down to a couple thousand and I can’t find any from my regular suppliers.
Otherwise, I’m sitting on a pile of components. Thinking about casting my own bullets and have recipes for emergency powder replacement. I’ve seen people reloading their primers on youtube, I hope it never comes down to that.
Primers are the things that become impossible to find whenever an ammo shortage hits. Given that primers will last for decades when stored in the proverbial "cool, dry place", there's much to be said for the practice of buying a few thousand, stashing them in an ammo can with some desiccant packs, and just putting them away for a rainy day.