This deal on the previous model Apple Watch is really good.
https://www.amazon.com/gp/product/B0...e?ie=UTF8&th=1
I bought this model a couple months ago primarily to track swim workouts, but I've found I love it all the time. It's obviously more than just a fitness tracker, but comparing the cost to FitBits, etc., it's really not that much more expensive.
I do use an iPhone and we're a mostly Apple product household, so I don't know how great it would be if pairing with a non-Apple phone.