Re: Nikon D850 for $2600 - NEW! Is it worth it?
Personally I wouldn't buy grey market. Not everything can be fixed by the other repair places, but that's just me. However, before you buy, be sure to check out ratings of the seller. There are some sellers that received really bad comments from buyers.
And some grey market items don't include everything such as a battery charger. The sellers try to upsell those other things that are typically included with a Nikon USA body. So in the end, a grey market D850 might cost more than the advertised price when you factor in all the normal things you'd usually receive. Good luck with whatever you decide.