I stocked up on rimfire ammo decades ago (and keep at least 5,000+ rounds in storage), and just cycle the old stuff as I buy new. I even have old Remington and Herters .22's that Grandfather bought back in the 50's & 60's that still shoots fine.
Don't buy the stuff at top dollar, because as previously mentioned, the prices WILL come back down, they always do. And when they drop, then stock up, as you can, a brick or two here and there.
I'm stocking up on strings, broadheads and arrows now, before they start talking about outlawing my recurve bows, LOL!!!!