Lowe’s has Iris Contact Sensor (compatible with Iris, SmartThings, etc.) on sale for $16.64, plus they seem to be running a buy-two-get-one free promotion*. Free store pick-up where available, or parcel shipping is free with (free) MyLowe’s account.
* If you add two or more sensors to your cart, you should see one "free gift" sensor in your cart for every two sensors you purchase.
This sale is 33% off the regular price, or more if you buy at least two sensors. Discounted pricing runs through 6/26/2017, or while supplies last. You may also be able to stack one or more (YMMV).
Although these sensors are made for use with the Lowe’s Iris platform, they use the Zigbee wireless protocol, and they should be compatible with most any Zigbee-compatible hub. I have been using several of them for over a year with SmartThings, and they have worked quite well for me.
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