The price of refurbished Nikon D600 cameras dropped to $1,325 on eBay with free shipping and 180 days warranty from Roberts Camera, an authorized Nikon dealer (see other listings). Adorama still sells the refurbished D600 for $1,499. Refurbished Nikon D7100 cameras are now listed for $889.99 (free shipping, 180 days warranty). Here are few other Nikon deals (all limited quantity):
More refurbished Nikon products are available here, here, here and here.