TomTop offers the Anboud Bluetooth Smart Keyless Lock in several colors (Grey pictured) for $17.69 with free shipping. That's $21 off list and the lowest price we could find. It works with Android and iOS devices and features a waterproof design. Deal ends September 11.

Note: The countdown timer on the product page does not reflect an actual expiration time and resets daily. This item ships from China and may take up to five weeks to arrive.