Today is September 10th, 2018 and the Nikon D850 is still out of stock at the three major online camera stores in the US (Adorama, B&H, Amazon). While the estimated shipping time at Amazon is 1-2 months (!), the inventory system at B&H gave up again and now they list the D850 as available on January 1st, 2100:
At the same time, grey market D85o cameras are easily available on eBay for $2,999.