Amazon has the 6-pk. 20x20x1 Aerostar air filters for $28.49 with Prime shipping. These have a MERV rating of 11 so equivalent of a 3M fitrate rating of 1000-1200 so good for allergies but at 1/3 of the price so I think these are a great deal. Note these are built sturdier than a 3M filter but are slightly smaller measuring 19.5 x 19.5 x 0.75 inches while the 3M filters are 19.7 x 19.7 x 0.75 per a review.
*note this ships in a clear pack unless you check the box to use Amazon shipping during check out to get it in a box so the item isn’t as visible
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