Amazon offers the 2nd-generation August Bluetooth Keyless Home Entry Smart Lock in Silver for $115.49 with free shipping. That's $5 under last month's mention and the lowest price we've seen. (It's the best deal now by $7.) It's compatible with most standard deadbolts, and works with Bluetooth-enabled devices to sense your approach and unlock automatically. It includes three mounting plates and three lock adapters; four AA batteries are required (and included).