Staples offers the refurbished Jawbone UP24 Fitness Tracker in several colors (Pink Coral pictured) for $15.99. Plus, Staples Rewards members bag free shipping. (Not a member? It's free to join.) That's $4 under the lowest price we could find for a new unit, although we saw a refurb for $2 less in January. It's available in sizes S to L and tracks steps, exercise, overall calories burned, quality of sleep, calories, and nutrition. Deal ends May 20.