Ending today, GearBest offers the Xiaomi Mi Band 1S Heart Rate Wristband in Black for $16.59 with free shipping. That's the lowest total price we could find by $2. Features include step, sleep, and heart rate tracking, Bluetooth 4.0, and compatibility with Android 4.4+ and iOS 7.0+.

Note: This item ships from mainland China and may take three to four weeks to arrive.