Gday Roger
The Startech was one brand i had found.
Just for others benefit, if getting a new PC and you want real COM and or LPT ports without needing add in cards, look for motherboards with "B" series Northbridge chipsets ( Intel only IIRC )
The main types would have B75 or B85 in their designations.
Many of these dont advertise it, but if you look at the specs, you will see a lot do have headers on the boards for real LPT and COM ports.
Andrew
PS just found this one
http://us.axiomtek.com/DownLoad/Spec/imb204.pdf
6 onboard "real" COM ports with 2 already fixed in the back panel + 1 LPT header