The Apple Watch Series 4 offers several improvements over the Series 3, including a larger display and an electrical heart sensor for running an ECG. And today you can get Apple's latest smartwatch for its lowest price ever.

The Apple Watch Series 4 is now on sale at Amazon. That deal applies to the 40mm GPS version of the Apple Watch Series 4, but if you'd prefer the 44mm version, you can get that at a discounted price, too.

One of the biggest improvements with the Apple Watch Series 4 is its screen, which is 30 percent larger than all previous Apple Watch models. It's also got that electrical heart sensor that'll let you take an ECG and get more info on your heart health. There's a 50 percent louder speaker in the Apple Watch Series 4, too, and an Apple S4 processor.

All of those features help to make the Apple Watch Series 4 the best smartwatch for iPhone owners and one of the best smartwatches on the market. If you're interested in getting a smartwatch to get notifications on your wrist, track your workouts, and more, these Amazon deals are definitely worth a look.