I've been trading ammo. The only reason I needed any was a decision changing calibers. So, if someone wants covidpanic prices, ok we'll deal on that basis, or we'll use former prices. My standard watchword is "equitable", and I try to use, say, Midway prices for valuation of both sides. Of course, one runs into buttholes who try to operate like car dealers, MSRP for theirs and below wholesale for yours. I just keep walking, as there's nothing you're going to do about them.
One major help is to be on a local forum, develop a group of friends and contacts, and deal with them.