Top Greener Inc via Amazon offers its Top Greener Humidity Sensor Switch for $41.99. Coupon code "FTGVCNTI" knocks it to $23.09. With free shipping, that's $6 under our December mention, $37 off list, and the lowest price we've seen. It can control both a bathroom fan and light simultaneously. When humidity exceeds a preset level, the switch will automatically turn on the fan. Deal ends January 31.