Instead of having several "why can't I find the Nikon ... in stock" I'm starting this thread to discuss the topic. Seems as though Nikon products are going to be very hard to find in the next several months. This is a direct result of the March 2011 earthquake and tsunami that struck very near Nikon's main Sendai factory.
All of Nikon's pro cameras (D700, D3S, D3X) are built there as well as many high-end lenses (70-200mm f2.8, 200mm f2, etc). The plant was shut down for several weeks but has reopened. However, due to power outages and product shortages from other manufacturers, it is not up to full production.
Nikon also has factories in Thailand and China that produce models and lenses such as the D3100, D5100, 18-55mm lens, etc. Those factories have not been shut down but shortages of key parts from Japan MAY also lead to shortages at those factories. These factories can not take over production of Nikon's pro equipment from Sendai.