Staples offers the FitBit Zip Wireless Activity Tracker in Green for $29. Plus, Staples Rewards members bag free shipping. (Not a member? It's free to join.) That's the lowest price we could find by $16 and the best deal we've seen. It features Bluetooth 4.0 connectivity and a free iPhone/Android app. It tracks steps, distances, and calories burned and wirelessly uploads data to your computer or phone so you can see graphs, set goals, and track progress, as well as post results to social media outlets.