X-Sense 10-Year Battery Combination Smoke & Carbon Monoxide Alarm Detector

This X-Sense smart mailbox alarm is $30, well below its 90-day Amazon average of $41. The kit includes the SBS50 base station, which can connect up to 50 X-Sense devices. The alarm works with curbside, wall mount, slot, and cluster mailboxes, but not mail slots without lids. Shipping is free. Buy Now at Amazon

Update: The price has changed to $139.99 since this was originally published.

This six-pack of X-Sense smoke detectors is $28 off the regular price of $165. Each alarm runs on a sealed 10-year battery, so there's no need to swap batteries over the unit's lifespan, and the whole set can interconnect with up to 18 compatible alarms so every detector sounds when one senses smoke. Buy Now at Amazon

This 5-pack of X-Sense SC06 smoke and carbon monoxide alarms is $30 off at Amazon, which works out to about $32 per alarm. Each unit has a sealed 10-year battery, so there are no battery swaps. These are standalone alarms and do not link wirelessly to each other. Shipping is free. Buy Now at Amazon

This X-Sense 5-pack of smoke detectors is $94 at Amazon, matching its Amazon all-time low and below its 90-day average of $106. Each alarm has a sealed 10-year battery, so there are no battery swaps for a decade. The alarms work on their own and do not connect to each other or to an app. Shipping is free. Buy Now at Amazon

Best Buy has eufy security gear on sale, covering smart locks, video doorbells, and outdoor cameras. The eufy Smart Lock C220 drops to $100, and the eufyCam 3 three-camera 4K solar kit with HomeBase 3 is $395, down from $600.  Buy Now at Best Buy

This X-Sense mailbox alarm is $14.98, down from $19.99, and matches its all-time low price. It sends a phone alert the moment mail arrives and runs on a battery rated for up to 4 years. Keep in mind it requires the SBS50 base station, which is sold separately. Free shipping applies for Prime members.  Buy Now at Amazon

Update: The price has dropped to $27.99 since this was originally published.

This bundle, which includes a Blink Outdoor 4 Camera and a Blink Battery Doorbell 2K+, is down 76% from its $130 price at Amazon. The Battery Doorbell 2K+ delivers 2K resolution with a head-to-toe field of view, while the Outdoor 4 covers the perimeter at 1080p; both run on AA lithium batteries rated for up to two years per charge and require no wiring. Person and vehicle detection alerts require a paid Blink subscription, sold separately. Buy Now at Amazon

This Blink Outdoor 4 camera and Wired Doorbell 2K+ bundle is $102 off at Amazon, a drop from the $130 regular price. It's the best deal we've seen for this bundle. The bundle includes the Sync Module Core and batteries for the camera, and the doorbell connects to existing doorbell wiring to ring inside the home. Shipping is free for Prime members. Buy Now at Amazon

This VEVOR enclosed mobility scooter is 50% off at Amazon. It's the best price we could find by $3,375. The 60V 58Ah battery is rated for up to 45 miles per charge, and the cabin includes a heater, sunroof, and reverse camera. Shipping is free. Buy Now at Amazon

Amazon's Black Friday sale is due to start on November 19, but in the meantime, you can find a large selection of early Black Friday deals spread across electronics, home, garden, apparel, and more. Discounts reach up to 65% off devices, up to 50% off outlet items, and up to 40% off toys. Sections for holiday decor under $50, gifts under $100, and essentials under $25 are also featured. Shipping is free for Prime members. Sale ends November 18. Shop Now at Amazon

Here you'll find the best limited-time offers that Amazon has available today. Shipping is free for Prime members. The sale refreshes at 3am ET each day. Shop Now at Amazon

As part of Amazon's Early Black Friday Sale, you can shop discounts of up to 65% off on a selection of Amazon devices. Select models are even at the best prices we've seen. Shipping is free for Prime members. Deal ends November 18. Shop Now at Amazon

At Amazon, this X-Sense radon detector is $26 off the regular price of $80. The built-in display shows short-term and long-term radon averages, so there are no lab fees or mail-in tests. It runs on 3 AA batteries, which are included, and the manufacturer backs it with a 5-year warranty. Shipping is free. Buy Now at Amazon

This X-Sense water leak detector set is $13 off, and the $50 price is below its Amazon 90-day average of $60. The kit includes four sensors and a base station, and the sensors are 0.7" thick for fitting behind toilets or under appliances. Shipping is free. Buy Now at Amazon

Update: The price has changed to $36.99 since this was originally published.

This X-Sense SC01 detector is at $36 for Prime members. That is its all-time low price on Amazon and beats the 90-day average of $42. It combines smoke and carbon monoxide detection in one unit with a 10-year sealed battery, so there's no wiring or separate battery replacements to worry about. It ships for free.  Buy Now at Amazon

X-Sense's SWS54 Wi-Fi water leak detector kit is $12 off at Amazon, and the price sits below its 90-day average of $47. The kit includes three sensors and a base station, and the sensors and base both sound 120 dB alarms. Shipping is free. Buy Now at Amazon