Prime Members: Winix 5510 True Hepa Air Purifier (Black or Charcoal Gray) $146 + Free S/H

Solid deal on the Winix 5510, which includes the upgraded PlasmaWave tech + a true HEPA filter + washable pre-filter and activated carbon filter. Essentially a beefed-up version of the popular 5500-2. I've been using the 5500-2 for a few years—great for allergies, smoke, and general air quality. Picked up a 5510 during Prime Day and just grabbed 2 more now at this price for the basement and kids' rooms. Quieter than expected on lower settings and auto mode is pretty responsive.