B&H Photo Video offers the Apple Watch Nike+ Series 3 GPS + Cellular 42mm Smartwatch in Space Gray/Midnight Fog or Space Gray/Anthracite for $299 with free shipping. That's tied with our Cyber Monday mention as the lowest price we've seen for a new cellular-enabled model. (It's the best deal we could find now by $81.) It includes a screen protector and your choice of band and features:

W2 dual-core processor

16GB internal storage

integrated GPS and GLONASS

watchOS 4.0