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Costco offers 50 FLTR General Use Face Mask for $ 9.99-$ 3.00 = $ 6.99 each ($ 3 manufacturer savings is valid 3/15/21 to 4/11/21). Buy 5 gets additional $ 30 off (Buy More & Save discount is valid 3/8/21 to 3/19/21).
The total cost for 250 masks is $ 4.95. Shipping is free.
Limit 2 Buy More & Save discounts per membership. So you can buy up to 500 masks for only $ 9.90.