I was looking for the same thing as you over the past couple of weeks, ssjgoku24.
I couldn't find any that exist so I just went and bought an Asus P5W DH Deluxe like most tech experts seem to be doing, it's Crossfire and not SLI though.
SLI isn't really a good idea from what I've read anyhow (bad value for your dollar), so it's not like it's a huge loss.