I know what the positive pressure masks are for or can help with. My point was that they are quite expensive comparatively. At any rate, getting PPE on the consumer side right now - even specialized PPE is pretty tough considering they are reserving a lot of if for medical and the rest has been bought up or hoarded long ago. To get a respirator (reusable) and filter cartridges, you’ll have to order and wait.
I've seen less expensive ones. The link was simply to the first example of the tech I found, and was for illustrative purposes only.
But the point is that only a tiny minority would ever need a PP mask. Most can do quite well with a non-PP mask. And on my wife's last grocery shopping trip, our local HEB store had, IN STOCK, both disposable and reusable masks, so apparently AMERICAN production has caught up with the lag.