Phottix now has their new BG-D800 battery grip for Nikon D800/D800E DSLR cameras available for sale ($145):
“Phottix Premium Series BG-D800 Battery Grip for Nikon D800 DSLR features AF/On button, command dials, vertical shutter button and multifunction controller. The BG-D800 holds 8 AA batteries or 1 EL-EL15 battery in the included trays.
The BG-D800 also provides a comfortable vertical grip with an additional shutter release and scroll wheel for easy access to the camera functions when shooting in the vertical orientation. The grip also has a tripod socket”
Included with the BG-D800 are: