Originally Posted by
Kapusta
You can still buy Ultegra 9 speed cassettes.
Yes, and you can still get Campag 9-speed cassettes. What I couldn't get was spare parts to repair my 9-speed brifter and the newer ones were no longer compatible. So for want of a little spring (apparently) I ended up having to replace the brifters and rear derailleur.
As it happens, I was eventually directed to Merlin Cycles who apparently have a bin full of old Campag spares and were able to fix it for me. But it was a long trail to get there.