We found this at 11 stores including Target, Walmart, and Best Buy. This product sells from $31.99 up to $60.89. Users can save 47% by shopping at Amazon.

Prices are currently low for this product, typically ranging from $38 to $53, and the lowest price we've seen is $29.74.

This product is also marketed as the 

Levoit PlasmaPro 400S Replacement Filter: True HEPA, Captures Odors, Mold, Dust, Pet Dander, Compatible with Levoit Air Purifiers at Target

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Levoit Core 400S Purifier Filter Upgrade LRF-C401S-P-WUS White US Standard at Walmart

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Core 400S Replacement Filter for Core 400S/400S-RF, LRF-C401S-WUS,3-in-1 True HEPA and Activated Carbon, Nylon Pre-Filter, 1 Pack, Green LUXRILIX at Amazon

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APPLIANCEMATES Core 400S Replacement Filter for LEVOIT Core 400S/Core 400S-P Toxin Absorber Air Purifier,Core 400S-RF-PA (LRF-C401-YUS) 3-in-1 True HEPA Activated Carbon Filter, 1 Pack,Green at Amazon

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LEVOIT Core 400S-P Air Purifier Original Replacement Filter, Supports HEPA Sleep Mode, 3-In-1 Filter, Efficiency Activated Carbon, Core 400S-RF (LRF-C401S-P-WUS), 1 Pack, White at Amazon

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Levoit Core 400S Replacement Filter at Home Depot

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Levoit 9.25-Inches W x 9.9-Inches H x 9.25-Inches L 400 True HEPA Air Purifier Filter at Lowe's

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Core 400S Replacement Filter for LEVOIT Core 400S and Core400S-P/Core 400S-rf Smart WiFi Air Purifier,3-in-1 True H13 HEPA Activated Carbon Pre-Filter,1Pack,White at Amazon

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Core 400S Replacement Filter, 3-in-1 H13 True HEPA, Compatible with LEVOIT Core 400S Air Purifier at Amazon

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Core 400S Toxin Absorber Replacement Filter for LEVOIT Core 400S and Core400S-P/Core 400S-rf Air Purifier,3-in-1 True H13 HEPA Activated Carbon Pre-Filter,Core400S-RF-TX (LRF-C401-GUS),1 Pack,Green at Amazon

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