There is existing DDR4 in existing machines that can be scavenged that would otherwise probably just be thrown out. I understand that secondhand memory was an industry even before the surge, remember reading a recent article about some California company that would strip servers of old DIMMs and sell them, mostly to China. The CEO was being interviewed, said that sales had surged recently.
searches
I don't think that these guys are them, think this is a different California company doing basically the same thing, but illustrates the point:
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I mean, I've thrown out old DIMMs. Wasn't worth my time hassling with trying to resell them. But if they're worth enough due to price increases, it'll increase the number of companies who are willing to go to the effort to recoup some of the value of the DIMMs. Companies can buy them, re-certify them, and sell them.
Obviously, that's not an unlimited supply, but the window in which it's of increased interest is probably only something like three years, so it doesn't have to last forever (or even fully offset the shortage to make sense to do, just partially-mitigate it).