One thing is for sure concerning the Microsoft Band – there has been way more demand compared to the availability of the hardware itself, and this does come across as surprising, taking into consideration how low key, relatively speaking, the piece of wearable technology was before it was introduced. In fact, the Microsoft Band has proved itself to be so popular, so much so that it has been sold out and unavailable online since late last month. Priced at $199.99 a pop, it comes with a heart rate sensor, and will boat of integration with Cortana whenever you pair it up alongside a Windows Phone 8.1 handset.