Been looking at these for a while. Seems to be the lowest price I’ve seen at $78.97 with free shipping over $25.
https://www.amazon.com/gp/product…A93O&
If you need a sensor to go along with it, your best option might be with the Smartest House as they have theirs with 1 sensor on sale for $109.94 with free shipping. Amazon’s price with an add on sensor would be approx $115.
https://www.thesmartest