Dell Small Business offers the Samsung SmartThings Multipurpose Sensor, model no. F-MLT-US-2, for $29.99 with free shipping. (Amazon charges the same for Prime members.) That's tied with our mention from a week ago and the lowest total price we could find by $27 from vendors with sufficient stock. This all-in-one sensor connects to a Samsung SmartThings Hub to detect vibration, orientation and angle, temperature, and when things open or close.

Also available is the Samsung SmartThings Motion Sensor for $29.99 with free shipping. (It's the same at Amazon for Prime members.) That's tied with our mention from a week ago and the best deal we could find today by $31 from vendors with sufficient stock. It connects to a Samsung SmartThings Hub to detect movement and turn lights on and off.