Lowes has the Iris motion sensor on sale for $23.30 which is 33% off. They are also offering a buy 2 get 1 free promotion. So effectively you get them for $15.53 each when you buy at least 2. These work great with Smartthings and have very quick reaction time in my experience with them. Can get free pickup or shipping depending on order and remember to add enough to use one of the available coupons!
https://www.lowes.com/pd/Iris-Mot…/999925310
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