Best Buy has Apple Watch Series 4 Aluminum Smartwatch in space gray, silver, or gold for $349 (regularly $399) and the 44mm model for $379 (regularly $429) with Free Shipping for a limited time. Amazon also has it for the same price with Free Shipping for a limited time.
ShopCellDeals through eBay also has the Apple Watch Series 4 GPS + Cellular 4G 40mm Aluminum Sport Smartwatch in gold w/ pink sport band for $399.99 (regularly $499) with Free Shipping for a limited time.
The Apple Watch Series 4 includes the new S4 dual-core processor, larger OLED Retina display, second-generation optical heart sensor, electrical heart sensor, built-in GPS, barometric altimeter that tracks how far and high you go, full water resistance of up to 50 meters, Bluetooth 5.0, Digital Crown with haptic feedback, run apps, track fitness, intelligent activity tracking and more. It can also connect directly to the Internet thanks to 802.11b/g/n Wi-Fi or Cellular (LTE models). The internal battery lasts for up to 18 hours of normal use and is recharged with an included inductive magnetic charger