Groupon offers the refurbished FitBit One Wireless Activity + Sleep Tracker in Black or Burgundy, model no. FB103, for $39.99 with free shipping. That's $20 under our March mention of an open-box model and the lowest total price we seen for a FitBit One in any condition. (It's also $35 under the best price we could find for a new one today.) One of the original wearable activity trackers, the FitBit One tracks calories burned, steps taken, distance walked, sleep, and stairs climbed.

No warranty information is provided.