D810 or D4

[Marcel]

You'd be wrong. Many Nikon dealers have an eBay store... B&H Photo, Adorama, Robert's Camera etc... eBay is just another market place for bricks & mortar stores...

Yes they do, but sometimes they'll sell their grey market stocks on ebay too.

 

[Fred Kingston]

Be an informed consumer and learn yo ask questions.

If it seems too good to be true... ask questions until you're satisfied... eBay's return policies are as good as anyone's...