Depends on your price range, and what you want to do with the card.
You can get quite expensive workstation cards which will do 4xDVI.
http://www.newegg.com/Product/Produc...82E16814139047
If it's not for gaming.
But considering the GPU level, it's quite a lot of money.
This guy on the forums is selling a hd4870x2 for 235$!!!!!
http://forums.anandtech.com/showthread.php?t=314649
no crap it dosent, but the asus or visiontek 3870x2 does.
Are you planning on gaming on all monitors.
You could just get a PCI video card
http://www.newegg.com/Product/Product.aspx?Item=N82E16814161074
Or cut down a pci-e to one of your 1x slots.