Update [12/3]: The 20% Prime card cashback promo is over.

Amazon has the new Samsung Galaxy Watch 3 45mm GPS Bluetooth Smart Watch with Advanced Health monitoring, Fitness Tracking and Long-Lasting Battery, 2020 model (Mystic Black, SM-R840NZKAXAR) for $329 with free shipping. Amazon Prime credit cardholders can get 20% back ($66 back). 

Features Bluetooth, Wi-Fi, NFC, GPS, integrated Bixby voice assistant, 1.4" OLED display. Here's the review from The Verge.