Amazon has the August Smart Lock 3rd Gen Technology in $55.30 with free shipping.
- Remotely lock/unlock and monitor your door as well to integrate with Alexa, Google Assistant, Airbnb, Home Away.
- Secure, keyless entry.
- Easily attaches to your existing deadbolt.
- Send guest keys from anywhere instantly.
- DoorSense to tell you the door completely closed and locked.
- Locks automatically.
- Simple DIY installation.