GearBest offers the 2nd-generation Xiaomi Smart Mi Air Purifier in White for $143.99. Coupon code "GBMiAirP" drops the price to $136.99. With $12.90 for shipping, that's $7 under last month's mention, $7 off, and the lowest price we've seen. It can purify 380 cubic meters of air per hour and features remote control via the Mi Smart Home app.
Note: This item ships from China and may take two to three weeks to arrive.