Walmart offers the second-generation August Bluetooth Keyless Home Entry Smart Lock in Silver, model no. ASL-02, for $179.99 with free shipping. (Amazon charges the same.) That's $3 under our mention from last week and the best price we've seen. (It's also a low by $4, although most stores charge around $229.) 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).