I have been looking for one for a while... Not sure if anyone is going to sell now because it is due to be upgraded soon. Maybe once replacement is announced, well see some D700s up for sale.
While you are waiting for D700 price to drop, check out Kodak Pro 14nx Full Frame DSLR. Incredibly sharp images with film like tones right out of the camera! Even has more megapixels than D700, if you care about that.