Cafago offers the Xiaomi Mi 2 Wireless Fitness Band in Black for $27.49. Coupon code "ZPA3642M" drops it to $15.99. With free shipping, that's the lowest price we could find by $8. Features include step, sleep, and heart-rate tracking, Bluetooth 4.0, and compatibility with Android and iOS devices.

Note: This item ships from China and may take two to six weeks to arrive.