Jet.com offers the second-generation August Bluetooth Keyless Home Entry Smart Lock in Red for $164.93 with free shipping. That's $5 under our April mention, the best deal now by $4, and the lowest price we've seen. 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).