Massive floods in Thailand have swamped Nikon and Sony factories there. From Thom Hogan:
So what things are made in the affected [Nikon] plant? D3100, D5100, D7000, D300s bodies, plus the 18-55mm DX, 18-105mm DX, 18-200mm DX, 70-300mm, and I think, 60mm Micro-Nikkor lens are assembled there, as well as the 24-120mm and 28-300mm. That’s basically the bulk of Nikon’s consumer DSLR sales, plus a large chunk of the low-end FX optics.
I’ve been pondering the Nikon 24-120mm VR F/4 lens. This is making me consider going ahead and getting one now before the supplies dry up.