Fitbit became the first of all smart watch manufacturers to support Windows Phone platform. Now, Microsoft is offering a great deal to celebrate this.
You can buy Lumia 635, which is one of the Windows Phone devices to currently support Fitbit (because of Lumia Cyan) and a FitBit Flex starting from $148.95. The bundle offer includes both AT&T and T-Mobile prepaid Lumia 635 and thus may vary by $30 in price based on which carrier you chose.