Here are a few links to other suppliers for optical isolation devices.
If you check them out I think you will find there are no high baud rate boxes with all lines isolated. If they were available, we wouldn't have made our own.
Telebyte - http://www.telebyteusa.com/catalog/prodlist.htm#opto isolated
Robust DataComm - http://www.robustdc.com/ov232ir9.htm
Patton - http://www.patton.com/cgi-patton/catalog-bin/prodlist.cgi
Black Box - http://catalog.blackbox.com/BlackBox/templates/blackbox/itemgroup1988guest.asp?param=216&ig_id=1988&title=Opto%2DIso
If you find any other links that should be listed here, let me know.