I am so grateful to the folks behind that site. It's the only reason I was able to track down units when I needed to buy them.

you not checking the site != people not being able to buy them

I'm not saying that it was easy, or anything like business as usual. They've done interviews where they talked about the difficult decision to prioritize companies that would go under without new stock over casual hobbyists. It's one of those unenviable situations where there's no good outcome, just a possibly less-bad one.