As one of its daily deals, Best Buy offers the Fitbit Flex Wireless Activity and Sleep Tracker Wristband in Black (pictured), model no. FB401BK, Slate, model no. FB401SL, or Lime, model no. FB401LE, for $79.99 with free shipping. (Amazon charges the same for Slate.) That's the lowest total price we could find in any color by $19. It tracks your daily activity and sleep patterns to help you attain your fitness goals. Deal ends today.