Riversong Global via Amazon offers the Riversong Fitness Tracker and Heart Rate Monitor Bracelet in several colors (Black pictured) for $33.88. Coupon code "7WXY7QAM" drops it to $19.99. Plus, Prime members bag free shipping. That's $40 off list and the lowest price we could find, although we saw it for $2 less in January. It features a heart rate monitor, step/calorie tracker, sleep tracker, and smartphone notifications.