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?
It's possible.
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
(
source)
Who knows what's the situation is like elsewhere.