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Yeah, it's still way more expensive than, say, Shimano stuff of the same era, which you can pick up for virtually nothing.
I managed to fluke a Chorus rear mech (medium cage), which gives me a fairly decent range at the rear, and already have the Chorus triple cranks. Could probably source a front mech for not too much, but the shifters are proving slightly costlier than I'd ideally like.
I keep hearing about the bottom falling out the vintage market, but 10 speed triple Campag stuff in Chorus and above is still bloody spendy in my experience, cost me a fortune sorting mine, tho admittedly the crank and shifters were NOS. The Chorus and up long cage rear derailleur was the extra hard to find part, I couldn't even find one in UK and had to get a Record one shipped from Germany at considerable expense.
Good luck on the search tho and hope you can find what you need.
I'm pretty sure you don't need a extra width bb so just the same 102mm width one that fits those 9/10 speed square taper double cranks.