aSavings via eBay offers the refurbished August Bluetooth Keyless Home Entry Smart Lock in Dark Grey or Silver for $94.99 with free shipping. (Add it to your cart to see this price.) That's $10 under last week's mention and the lowest price we could find for a refurb by $44. 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).
Note: A 1-year warranty applies, but it's unclear who provides it.