I purchased masks with replaceable filters but noticed on Amazon that dozens of mask products are either unavailable, or awaiting a new shipment sometime next month or order today and receive delivery in March.....not a good sign. I went to the tool section and purchased a product that came with two masks and six filters then purchased another set of 20 filters. That should hold for a while. These are the N-99 masks with two exhale holes instead of one with the N-95. The filters are carbon activated, etc...down to .1 micron etc....should work just fine...Ended up spending around $30 for the whole kit and kaboodle...
The N99’s are good. N100 is best. Also there are P95, P99 and P100. Costs more but they also remove oils.
Taiwan has banned exporting their masks.