Amazon offers the August Bluetooth Keyless Home Entry Smart Lock in Red, model no. AUG-SL01-M01, for $149.99 with free shipping. That's tied with our expired mention from four days ago and the lowest total price we could find by $36. It's compatible with most standard deadbolts, and works with most Bluetooth-enabled devices to sense your approach and unlock automatically. It includes three mounting plates and lock adapters, and requires four AA batteries (included).