TomTop offers the M2 Smart Heart Rate Bracelet in several colors for $6.99. Coupon code "WDCSW" drops it to $5.99. That's the lowest price we could find by $3. It features Bluetooth 4.0, sleep and step tracker, and is compatible with iOS or Android devices. Deal ends August 30.

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

Update: The price has dropped to $5.99. The coupon no longer applies.