Home Depot: Weiser SmartCode Touchpad Matte Black Keyless Door Deadbolt - $129 (was $199)

I have this exact lock and absolutely love it. It works really well, and the battery lasts a long time. It has all the basic functions you would expect from a keyless lock, without the fancy Bluetooth/Wi-Fi features that can drain the batteries like crazy. One of the main reasons I like this particular lock is how quickly it locks and unlocks without draining the batteries. Imagine coming back from vacation only to find out that your lock has run out of juice—and you don't have a physical key with you to unlock it. Not fun at all!