I have a Really Right Stuff BD600-L L-Plate for sale. It is for a D600 without a grip. I purchased it new last month, and it is still in pristine, like new condition.
Here is a link to the plate on the RRS website:
NOTE: Not compatible with Nikon's LCD screen protector.
The price is $95 and includes fees and shipping via UPS within the continental US. PayPal and US Nikonians only please.