Newegg offers the refurbished August Bluetooth Keyless Home Entry Smart Lock
in Gray, model no. AUG-SL01-M01-G01, for $134.99
with free shipping
. That's $64 under the lowest total price we could find for a new model. 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).
A 1-year warranty applies, although it's unclear who backs it.