N95 masks/respirators by 3M for $1 a piece is about as low as I’ve ever seen them. Stock up before the prices skyrocket and stay safe my friends 
From the product page:
3M Personal Protective Equipment Particulate Respirator 8210, N95, Smoke, Dust, Grinding, Sanding, Sawing, Sweeping, 20/Pack
NIOSH APPROVED: For at least 95 percent filtration efficiency against certain non-oil based particles
COMPATIBLE: With a variety of protective eyewear and hearing protection
ADJUSTABLE NOSECLIP: Reduces potential for eyewear fogging and helps provide a custom and secure seal
TWO-STRAP DESIGN: With welded dual point attachement that helps provide a secure fit.
APPLICATIONS: Gringing, sanding, sweeping, bagging, and other dusty operations.
For industrial/occupational use only. Not for consumer sale or use.
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