The standard Nest Doorbell makes it easy to identify visitors and packages when you’re not at home. | Image: Google Buying a video doorbell is worth it for several reasons. They’re convenient if you get a lot of deliveries or visitors, as they let you glance at a phone alert to decide whether it’s necessary to drop everything and go to the door. They can provide peace of mind, too, particularly if you’re heading out of town on vacation. Fortunately, Google’s entry-level Nest Doorbell — one of the best models available — is on sale for $139.99 ($40 off) at Amazon, Best Buy, and Target in the run-up to Amazon’s Big Spring Sale, which starts on March 25th. Google Nest Doorbell (second-gen, battery) Where to Buy: $179.99 $139.99 at Amazon $179.99 $139.99 at Target $179.99 $139.99 at Best Buy Unlike Ring’s $100 battery-powered Video Doorbell, Google’s Nest Doorbell doesn’t require a paid subscription for smart alerts — you’ll be notified for free via the Google Home app if the doorb