Northwest Outdoor via eBay offers the refurbished Garmin Vivosmart HR Activity Tracker in Black for $56.99 with free shipping. That's the lowest price we could find by $3 for a refurb, although we saw it for a buck less last month. It monitors heart rate, calories burned, distance traveled, steps taken, stairs climbed, and activity intensity. It features a 160x68 touchscreen LCD, smart notifications for calls, texts, and e-mails, an alarm, and a five-day rechargeable battery. A 1-year Garmin warranty applies.