I've been building up my parts stash of C&V parts for my C&V bikes since no LBSs in the area save anything 'that old'. Go into any shop around here and ask if they have any freewheels and they look at you like you're speaking Martian.
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'75 Fuji S-10S bought new, 52k+ miles and still going!
'84 Univega Gran Tourismo
'84 Univega Viva Sport
'86 Miyata 710
'90 Schwinn Woodlands
Unknown brand MTB of questionable lineage aka 'Mutt Trail Bike'
Plus or minus a few others from time-to-time