Nest threw out all of the old assumptions about home security systems, and built something pretty great with the new Nest Secure, and you can save $100 on the usual price of the starter bundle today on eBay.

$400 gets you the Nest Guard (the big keypad thing that doubles as a motion detector), a couple of Nest Tags that can disarm it instantly, and two Nest Detects which can monitor entire rooms for motion, and also detect when windows or doors open.

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Gizmodo’s review has more details about how all of these pieces fit together, and there are more add-ons that you can purchase a la carte to fit your home’s needs.