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Ending today, Beach Camera via Rakuten offers the Nest Protect Smoke and CO Alarm 3-Pack for $327. Coupon code "SAVE15" cuts that to $279.65. With free shipping, that's the best price we could find by $47, although we saw it for $13 less in December. They feature a 120ยบ field of view to 20 feet and work with the Nest app to send motion alerts.