Best Buy offers its MyBestBuy members the Ring Alarm Contact Sensor 2-Pack for $29.99 with free shipping. (You must be signed in to see this price. Not a member? It’s free to join.) That’s the lowest price we could find by $7. They sense when a door or window is open and send an alert to your mobile device or PC.
Also available to MyBestBuy members is the Ring Alarm Motion Detector 2-Pack for $44.99 with free shipping. That’s the best deal we could find by $5. Mounting hardware is included.
Of note, a Ring Alarm Base Station is required for both of these items, but not included.