Apple Watch Series 9 vs. SE: A smartwatch skeptic tested both for 13 days

Some features require you to shell out a little more. For example, a stainless steel chassis is an extra $50 and a bigger case size (i.e., 44mm) is an extra $30. If you want GPS and cellular support, that will set you back $50. The Apple Watch Series 9 costs $399 on Apple’s official website (again, this is the cheapest you can get in this model).