OXA USA via Amazon offers the Koios Desktop Air Purifier with True HEPA Filter for $59.99. Coupon code "QZSYG89I" knocks it to $39.59. With free shipping, that's a buck under our mention from three weeks ago and the lowest price we could find by around $29. It features 1-button operation and max air flow of 16 CFM. Deal ends January 31.