I didn't find any cards on my breif look through newegg. There was some drive bay thing for $16 but I didn't click on it.
I think NMC is probably right, just better off getting 2 cards. You can get some eSATA plates that just run a line to your internal SATA connection, so you could do that if you are concerned about using up PCI slots. Of course your case would need to have a 'slot' where you didn't already have one in use.