Wirecutter Pick, rare sale. Walmart has a Coway Airmega 200M Air Purifier with True HEPA and Eco Mode Sale, $149.00 Free Shipping. Expires: 6/22/2021 - Highly Rated at 4.7 out of 5 stars.

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• Coway Airmega is designed to accommodate room sizes up to 361 sq.ft (CADR: Dust 246 / Pollen 240 / Smoke 233 cb. ft.).
• 4-Stage Filtration System (Pre-filter, Deodorization filter, True HEPA filter, Vital Ion) captures and reduces up to 99.97% of 0.3 micron particles in the air, including pollen, pollutants and other allergens. It also reduces volatile organic compounds and reduces odor.
• Pre-filter is washable and permanent, designed to catch larger dust particles.