If you really want Tri SLI and you don’t want a reference board, this is a real deal for you. Asus managed to ship a few ASUS P5N-T Deluxe boards powered by nforce 780i SLI chipsets, and Newegg.com actually has a few in stock.
It won’t be cheap, as it retails for about $339.99, and on top of that you will have to pay $7.14 for the post fees, but it is the only Nforce 780i (seven ATI when you spell it) in stock.
The board looks hot, but if you plug in three 8800 GTX or Ultra cards, you will run out of any other slots.
If you are still interested, you can get it here.