Every D800 is being sold on an allotted basis. That means, you'll be waiting until the Toronto Maple Leafs win their next Stanley Cup to buy a D800 or 800E from inventory hanging around on a store shelf. That could be a very, very, very long time. The only way to guarantee acquisition of a D800 in the next 5-6 months is to actually place a deposit for one at an online or brick & mortar authorized dealer. Demand is high, unit production is late and well behind what it would have been if Japan hadn't suffered 'quake and tsunami disaster last year and if Thailand hadn't been drenched for months last year.
There are plenty of heavy-duty Nikon authorized dealers that will accept returns of almost everything they sell. For some buyers, that means they'll be able to purchase an open-box or customer return at a slight discount; a very slight discount if current pre-order frenzy is anything to go by. Then again, customers still waiting for their deposit pre-paid orders may be given first crack at open-box and customer return units.