3M N95 Disposable Respirator, VFlex Particulate Respirator 9105S, Small Size, Box of 50, NIOSH Approved, Sweeping, Sanding, Grinding, Sawing, Bagging, Dust

You can buy singles of some respirators on Digikey! https://www.digikey.com/en/products/filter/personal-protective-equipment-ppe/259?s=N4IgTCBcDaIHYE4CsIC6BfIA This is the Vflex small: https://www.digikey.com/en/products/detail/3m/9105S/5128357 I buy mine on Amazon, but you may not want a 50 pack yet: https://www.amazon.com/3M-17394-Particulate-Respirator-Height/dp/B06WD6B3QX/ Of course, if you have a mask bloc nearby, the best option would be to ask them for samples of respirators to try.