Just came back from Costco, and they have a D600 package designed for Costco only. Includes D600, 24-85 VR, 70-300 VR, custom Nikon shoulder bag, 32 GB SD card, and WU-1b wireless dongle. For $2389. That is the best deal I've seen yet on D600.
The bag is a really nice messenger bag that holds the body with lens plus two other lenses and accessories in a reasonable space. And, although the bag is Nikon, it doesn't have the big logo on it to attract unwanted attention. I looked all over, and could not find the bag anywhere on line.
I just bought the D600 + 24-85 zoom package from B&H. Since I also just bought the new 70-200 f/4, I decided the Costco package was not such a great deal that would make it worth returning my camera to B&H.
But some other Nikonians might be interested - if they know about the deal ???