Filtrete Air Filters, Starting at $22 on Amazon

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The price of these Filtrete air filters dropped to as low as $22.32 on Amazon. Score a variety of sizes in 2-, 4-, or 6-packs. This is the lowest price we've seen in the past month.

Note that some of these prices are contingent on using Subscribe & Save; make sure you have five items added for delivery to the same address in a single month to access the maximum discount.