You try finding a PAPR in stock for sale to anyone who isn't a purchaser for a medical provider or first responder agency right now..

True story: I almost bought a 3M PAPR last fall because I wanted it for a "The Expanse" prop replica space suit I've been thinking about building. Decided that a few hundred bucks was too much to spend for the look of something alone, though. That would've been the best gratuitous purchase I ever made, in hindsight. Of course I probably still wouldn't be able to get filters for the thing, and properly caring for and disinfecting non-disposable hardware like that is nontrivial...