Ebay is, usually, the best place to find hard to find stuff. I do buy what I need but do so with great care.
As for selling, Ebay has screwed me, helping dishonest buyers, in the past. Sadly, for me in a horribly weak market area, Ebay is my second choice for selling stuff. Bike Forums is my first choice. Why?
Because when I sell, it is not just for the money. I sell to help others and I would rather help my on-line friends than strangers.
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"98% of the bikes I buy are projects".