Right now, you can get the Fitbit Charge 4 on sale for $139.89 ... slick designs and various tracking features. As for the 4S, Amazon says it can monitor your estimated hydration levels and ...
The best Fitbit on a budget right now is the Fitbit Inspire 3 for $99 at Amazon. It's one of our favorite Fitbits and the best in terms of value for money. It's also great for beginners.