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Not sure if this has been posted:
Ring 10 piece Wireless Security System. $ 239.99 -$ 60 instant rebate.
$ 60 off valid until 1/5. (In store and online)

Includes:
(Keypad, Base Station, Range Extender, Motion Detector, and (6) Contact Sensors

Also on Costco.com:

4 pack of sensors: $ 69.99 S/H included

https://www.costco.com/ring-doorw…sVBqRkmhr5