Amazon currently has a deal on the Nikkor AF-S 50mm f/1.4G lens for $349.99 (original price: $439, $90 off, free shipping). This is a new lens and you don’t have to buy anything else in order to qualify for the savings – just add the item to your cart to see the final price.
Update: the same deal is available also on BestBuy’s website:
All Amazon Cyber Monday deals on camera, photo & video gear are listed on this page. More Cyber Monday offers are listed on PhotoRumors.