Shop 3M Sales and Deals

Walmart offers the 3M Filtrete Allergen Defense HVAC Filter 3-Pack for $15.88. Opt for in-store pickup to dodge the $5.99 shipping charge. That's tied with our June mention and the lowest price we could find by $4. They feature an 800 MPR, and each filter lasts up to three months. They're available in sizes 14" x 20" x 1" or 18" x 24" x 1" 12" x 24" x 1" to 20" x 20" x 1" 20" x 30" x 1".

Amazon offers the 3M 8293 P100 Disposable Particulate Cup Respirator for $8.68 with free shipping for Prime members. (Walmart charges the same via pickup.) That's tied with our mention from a month ago and the lowest price we could find now by $3. It received the highest rating (P100) for filtration efficiency in a filtering face-piece respirator from the National Institute for Occupational Safety and Health. Features include a Cool Flow exhalation valve, foam face seal, and adjustable noseclip and straps.

Update: The price now drops to $8.40 in-cart at Amazon, or when you choose in-store pickup at Walmart.