I’ve had a couple around for a few years, since I did some renovations at my place. I wore one to the supermarket the other day, because the time before that the store was fully of idiot 20-somethings who would not maintain six feet separation.
I bought a box of the exhalation valve type for allergy-season mowing & cycling.
This type is unsuitable for protecting others, when worn by a suspected COVID-19 carrier.
Great for cycling though!