Hello Oxygen,
We actually do still sell that card, or the equivalent thereof. There are multiple names for some of our cards, and the PCI-MIO-16E-4 is our PCI-6040E. The product page for this card is linked below.
http://sine.ni.com/apps/we/nioc.vp?lang=US&cid=10795
I hope this helps!
Matthew C
Applications Engineer
National Instruments