These Microsoft Band 2 Activity and Heart Rate Trackers drop from $249.99 to $99.99 in all sizes at BestBuy.com. Plus, shipping is free making this the best price we found by $75 in size large. These wristbands measure heart rate, steps taken, calories burned, sleep quality, hours slept and more. Choose from 3 sizes while supplies last. Sales tax is charged in most states.