I'd be happy take a special order if I were in the LBS,
out here the 10 speed stuff is about all, the locals are willing to spring for ,
so that is what the spares inventory is 10 and less, ..
Touring riders on the latest Kit that have parts problems , [& Campag Ergo, in general ]
often get a non waiting around bene-sugg to limp a couple days down the coast ,
and a colleague shop will get a call ahead
and they will have , because of the communication , the parts when you get there.
Myself, I dropped off the derailleur band wagon entirely . [at about 7 'speeds']
I now Plod along on my IGH bikes ..