Amazon has the 3rd Gen August Smart Lock (Silver, works with Alexa, Google Assistant & more) for a low $108.98 Free Shipping. This is originally $150, so you save 34% off. This can be set to unlock automatically as you arrive home or lock when leaving
Control and monitor your door from anywhere.
Lock and unlock your door, control keyless access
Installs inside your door in about 10 minutes with just a screwdriver
Auto-unlock when you arrive home. Auto-locks when you leave
When batteries need replacing, you'll be notified by the August app