It's in the US, but: eBay 370550488176 has it for $90 (+$15 shipping) for
a Buy It Now. That's pretty typical for what I've seen on eBay when I've
looked.
Thanks for the hint! Recently I got a contact of a site still running '11s
in Production. I think for CNC-Machines or something like that. Maybe I can
get a spare one from there... It's a matter of carefully asking the right
person ;)
The cables are probably a different matter, but they
can't be that hard to
make yourself with a crimper and generic card edge/pin connectors (I
certainly did so for my Pertec interface tape drive with no problem for $20
for two 3-6 foot lengths of cable and it works fine).
As you stated, this should not be too hard to do. I have a Crimper in my
Lab, the connectors should be obtainable and Cable is on stock.