Save up to $300 on the Apple Watch Series 5 on Amazon
Before we go any further though, it's important to mention that you'll be getting the biggest discount by purchasing the GPS+cellular version of the Apple Watch Series 5, which is typically more expensive than the GPS-only model.
Equally important is the fact that the $300 discount is only available for the Gold Stainless Steel with Stone Sport Band. Of course, additional color options are on sale, but the discount is nowhere near as good as the first one.
Getting the Apple Watch Series 5 (GPS+cellular) requires you to pair it with a data plan if you want to use cellular service. Obviously, this one is only compatible with iPhones that run iOS 13 or later, so make sure that your iPhone is not too old (any model starting with the iPhone 6s should be fine).