FYI, looks like prices are dropping on these (and I expect they will continue to do so after the initial price gouging. 50 pcs for $12.79 here (w/free shipping):
https://www.amazon.com/Disposable-Face-Masks-Breathable-Comfortable/dp/B084TQKLCC/ref=sr_1_13?crid=67AYSDOAAMV&dchild=1&keywords=50+pcs+filter+3-ply+face+mask&qid=1590608502&sprefix=50+pcs%2Caps%2C193&sr=8-13