Thumb Score: +23 Amazon.com has Airthings Corentium Home Portable Radon Detector (233) on sale for $99. Shipping is free. Thanks to Deal Editor Discombobulated for finding this deal. Includes:[LIST][*]Airthings Corentium Home[*]3 AAA batteries[*]Quick Start Guide[*]Airthings 12-months & Customer Support access via Airthings App or website