Honestly, I thought it was a joke or a scam when I first saw it, I kept on reading it and re-reading it again to find the catch, when I didn't I couldn't help but buy it. That's insane, $750 price drop in 6 months. All I can say is the D800 must be killing them, feel sorry for those who paid the full price just a few weeks ago. At this price, they can move a few thousands in a week.
Do you really think that price drop is because of what you may think is the volume of d800 sales?
On Amazon, the D800 Body is currently the 4th best-selling DSLR while 5D3 is sitting on the 8th (BO) and 13th (Kit) positions. The 5D2 BO & Kit are currently on the 9th and 26th positions, respectively (source
On Amazon Japan, the D800 Body is currently the 54th best-selling DSLR. The D600 is number 9 already. Canon 5D offerings hold these positions:
5D Mark II BO: 44
5D Mark II Kit: 59
5D Mark III BO: 62
Who knows what's the situation is like elsewhere.