Academy Has frequent sales and good prices as a rule. Get all you can get your hands on.
That might sound extreme, but if you're younger than I am (62) you could live long enough to see push come to shove. Anti's would certainly see the value of rationing ammunition and implement that policy if given half a chance.
Stored properly, ammunition can last a looong time. If there's ever a shortage, you don't want to miss going to the range because you haven't enough ammo. You can car pool as many already are doing, but you can't "pool" a finite number of rounds and have enough to go around. Especially if you and a few others are providing the bulk of the supply.
Troubled times, my friends. Take care and be pro active.