Best Buy via Google Express has for New Google Express Customers: Ring Protect Contact Door and Window Sensor pack of 2 for $35.99 – 20% off with code HOLIDAY18 = $28.79 + tax. Shipping is free.
Additionally the motion sensors would be $43.20 with same discount, also 2 pack.
Both beat costco prices slightly.
Note, offer is only valid for New Google Express Customers
https://express.google.
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