Microsoft Band no longer available online23
The Microsoft Band is available in the U.S. only, and one of the reasons for its success is its multi-platform support. The Band works with Windows Phone 8.1, Android (version 4.3 or newer), and iOS (7.1 and 8). With Windows Phone, there is integration with personal assistant Cortana. The Band also has an optical heart rate monitor, accelerometer, GPS, and a sensor that monitors skin temperature.
Obviously, the software giant didn't figure on its band being as popular as it turned out to be. If you are jonesing for the Microsoft Band, your best bet is to check with the Microsoft Stores in your area to see if you are lucky enough to find a store that has one of the few units remaining.
source: gdgtarena via WMPoweruser