This is precisely why preppers stockpiling ammo is way too stigmatized, it's not about insane militia crap for 99% of preppers nor is it something that should scare people. I have the stockpile to sell some, shoot for fun/training, use for hunting/slaughter, continue reloading operations, protect my home/property, and still be well off enough to avoid having to purchase (ie during a temporary price hike like this) even it lasts in excess of a few years.
When people talk about preppers bartering or trading ammunition, that shouldn't be something that's reserved until after some sort of doomsday. Average prices of ammunition fluctuate just like stocks, it just makes sense it's just smart to buy low then sell high. It just happens that buying in bulk tends to be cheaper — and when the price goes up, you make more return.
Aside from that, just simple supplies for when supplies are generally unavailable. This is why I have N95s, hand sanitizer, antiseptics — this is stuff I've had for years, and it's not like I went out splerged when I realized crap was going to get expensive.