The grey market Nikon D850 camera got its first price cut of $100 on eBay (final price: $3,199.99, current MSRP is $3,296.95).
Grey market Nikon gear does not come with US warranty (it only comes with store warranty).
Purchasing third party warranty (like Mack) is also an options.
Back in 2016 Nikon USA allowed repairing some Nikon grey market cameras at third party US repair facilities.