Open box condition, used once, like new. Original unit was $300.
Will deliver on-campus and nearby Stanford area as well!

Great for filtering smoke, odors, dust, mold, pollen, and other allergens.
Quiet; not louder than a whisper on low (~31 dB) and at most the noise level of rainfall on high (~56 dB).
For mid-size rooms up to 540 sqft. Measures 13" x 13" x 21". Each filter up to 4,380 hours of use.

https://www.amazon.com/Purifier-Washable-Pre-Filters-Particle-Allergens/dp/B073WJL99W