They've been very difficult to find for a while now, and I believe have been recently discontinued.
The 7990 and 690 are on their way within the next month or so.
But hey, you could always buy something like this --> http://www.ebay.com/itm/ASUS-MARS-II-2DIS-3GD5-Graphics-Card-/320889042032?pt=PCC_Video_TV_Cards&hash=item4ab67a3470
Erm no! Wow you would have to be a complete moron to buy that at that price. I know you were just having a laugh.
Thanks anyway for the info BigMack70!