Buy Guard Dog Sliding Door Security Bar… $49.99 4. Defender Security Satin Nickel U 10827 Door Reinforcement Lock At only three inches tall, this little lock installs in minutes, and can ...

Nest is selling the whole Secure system in a starter pack, which includes the Guard, two Detects, and two Tags, for $499 this November starting in the US; Canada and Europe are coming next year.