I know it's not a good idea and we're not supposed to, but I have re-used some lids after water-bath canning. I'd love to buy new if I could find any, but there are never any in stock at any of the stores I go to!And I talked to the folks at Farr's (Farr's Has Everything!) and they said getting canning jars and lids is going to be even harder than it was last year. That their supplier is rationing them out a tiny bit at a time. I know the Walmart I do my grocery pickups from has been out of everything for months, the while I still see some on Amazon, the prices they're asking are insane. Not likely to be many in yard sales here since this is such a small rural town and just about everyone cans so I'll have to start hitting the Coos Bay yard sales I guess. @WthrLady, you said you reused lids? How do you go about it?
I try to be really careful when opening a jar, so as not to bend or put a dent in the lid, or to put any rips or scrapes in the rubbery edge surface where it seals. I only re-use it if there are no dents, bends, rust, and after closely inspecting the seal and making sure there are no faulty spots or places where it's detaching. So maybe one out of every three or four lids, I use a second time, but only for fermented/pickled products. And of course, I make sure the new jar I use it on gets a good seal.
I realize it's a risk and I'm not recommending this to anybody, just saying I've done this and never had bad results.