B&H Photo has the Apple Watch Series 3 38mm GPS + Cellular Smartwatch (including Nike+ Models) for $279 (regularly $379) and the 42mm model for $309 (regularly $409) for a limited time.
Walmart is still discounting a bunch of Apple Watch Series 3 Aluminum Smartwatch in space gray or silver bundled with an extra Apple Watch Woven Nylon or Sports Band, starting at $259 with Free Shipping for a limited time.
The Apple Watch Series 3 includes the new W2 dual-core processor, OLED Retina display, built-in GPS, barometric altimeter that tracks how far and high you go, full water resistance of up to 50 meters and connects to your iPhone via Bluetooth 4.2 to displays notifications, 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