Amazon has a new exclusive deal where you can get $200 credit on 41 different Nikon cameras and lenses (valid also for other brands). You can see the list of qualifying products here (includes the D750, D810, Df cameras, the latest 200-500mm and 300mm f/4 lenses and more).
More Nikon deals are listed here.
Other Black Friday deals can be found here.
Here are the full details on Amazon offer:
Offer: Get a $200 Credit Toward a Future Purchase with a Qualifying Top-Rated Camera or Lens Purchase With Code CAMERAGIFT
Instructions:
Step 1: Buy a qualifying camera or lens listed below that is shipped and sold by Amazon.com. Customers must use code CAMERAGIFT at checkout to participate in the promotion.
Qualifying products and additional details can be found here.
Step 2: After 30 days, customers will receive an email from Amazon indicating that a $200 promotional credit has been automatically applied to your account for a future Camera, Photo & Video store purchase
Step 3: Use the link provided in the email to shop the Camera, Photo & Video products shipped and sold by Amazon. Your credit will automatically be applied to your Cart at checkout
Promotion Timeline:
Offer Available: 11/26-12/31/15
Future credit is redeemable until March 31, 2016