Winix C909 4-Stage Air Purifier for $160 + $4.99 shipping

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Costco members can snag this Winix C909 air purifier at $40 off, dropping it to $159.99. It covers rooms up to 500 sq. ft., includes two True HEPA filter sets rated for up to 24 months of use, and runs as quiet as 25 decibels on its lowest setting. Wi-Fi connectivity lets you monitor air quality and control the unit remotely through the Winix Smart App. It's important to note that this item doesn't include free shipping and handling, though at $4.99 for shipping, it's not an unreasonable charge.