[Update: It's currently out of stock, but you can still back-order it as this price.]
B&H has the Canon EF 40mm f/2.8 STM lens refurbished for $149.95 (compare new at $199). Check it out here at B&H Photo.
ebay (via robertscamera) has the Nikon D800 (refurbished by Nikon) for $2099.99 (compare to $2799 new). There are limited quantities available, so act fast on this if you are thinking about it. Check it out here on ebay.
ebay (via robertscamera) has the Nikon D600 refurbished by Nikon USA for $1300. The listing says it includes a 6 month warranty and robertscamera has a 99.5% positive rating. Check it out here on ebay.
You can also find a Nikon D600 kit with 24-85mm VR lens refurbished for $1699.95 here at B&H Photo.