Today only, A4C offers the used Fitbit Charge 2 HR Wireless Activity Wristband in Large or Small for $39.95 with free shipping. That's tied with our February mention and the best deal we've seen for this tracker in any condition. (It's also $60 below the lowest price we could find for a new one today.) It tracks steps, distance, sleep, and calories, and features: OLED display with clock continuous heart rate monitoring multi-sport modes Bluetooth 4.0 & wireless sync with supported computers and smartphones battery life of up to five days