Hello, I hope you are doing well.
BestBuy.com has Samsung SmartThings Multipurpose Sensor for $14.99. Shipping is $5.49. Receive free shipping if your order total is $35, or if you order at least one other item listed below.
There are at least two other Samsung SmartThings accessories on sale at BestBuy.com:
Enjoy!
Tofu Vic