You asked about sourcing and price, so I'll chime in here since my company sells these.

We're getting a large shipment of ***NIOSH-approved*** N95's in August and are currently accepting case (400 masks per case) pre-orders by email only.  Our pricing is under $2 each because, as I've mentioned, price gouging really raises my hackles.  I see folks asking twice (or eight) times that for KN95 wannabes of unknown origin.

We have a link on our site here: https://www.safetyemporium.com/11156  What we are actually shipping is the next-gen model, the Bielcor 201. I've been wearing the prototype for a week now and I really like it.  These are also NIOSH-approved and they did away with the metal nosepiece - instead there is a soft fabric inner flap to make the nose seal painless..  No staples - the elastics connect with a fusion weld to the mask.  And the straps are stretchy fabric instead of exposed elastic.  The inside is a soft fabric.  Very very nice.  I really like them.   And they are seeking FDA approval - no timeline on that, but it should be quicker than normal as they already have the NIOSH approval.  We will try to get the new info on our web site around the end of the month.

We just opened pre-orders on another batch of N99's with exhalation valves which will be shipping later this month: https://www.safetyemporium.com/11155  Probably overkill for the lab, but the key point is available.

Both are cup style one size fits most.  Perhaps overkill for the teaching lab, but for full time researchers and anyone medical (dentistry in particular) they're right on target.

Surgical masks are inexpensive enough that I would tend to go with disposal.  If you want the higher protection of an N90-100 mask and want to save money/resources, I'd reuse them if they are not soiled.  Personally, I would have ones labeled Mon through Friday.  Use the Monday one, put it in an unsealed paper bag somewhere at the end of the day, and when the next week rolls along whatever contamination is on there should be dead. Your mileage may vary.

Rob Toreki