$160 -Airthings 2989 View Radon - Radon Monitor with Humidity & Temperature Detector - Battery Powered Mobile APP, WiFi

it has been this price several times according to that site, but if you're in the market it's that price right now :-) Airthings 2989 View Radon - Radon Monitor with Humidity & Temperature Detector - Battery Powered Mobile APP, WiFi, Alerts & Notificationshttps://www.amazon.com/dp/B09SQ64K7Q