Are you looking for a full-featured fitness tracker on the cheap? Then Amazon has Microsoft's branded Band for $50 off today. That brings the price down to $150, pretty reasonable for a tracker with a full-color screen and a heart monitor built in. (The price from Microsoft's store is already a bit discounted, down to $180.) It comes with free shipping, and Amazon Prime members can get two-day shipping for gratis as well. All three models of the Band, large, medium, and small, get the same discount.
The design of the Microsoft Band is remarkably similar to the Samsung Gear Fit from back in 2014, minus the curved screen. It's a wide touchscreen meant to be read horizontally, the opposite of a conventional smartwatch (if such a thing exists at this point). It runs proprietary Microsoft software, though it is compatible with the Microsoft Health companion app on Android, iOS, and Windows Phone. An SDK is available, and there are plenty of compatible apps on the Play Store. The Band's default functions include step tracking, sleep tracking, calorie tracking, heart rate monitoring, and notifications from your connected phone.
This doesn't appear to be a sale or promotional price. A new Microsoft Band model is expected sometime in October, so perhaps retailers are just clearing out old stock. It's a decent deal in any case.