I have repro orange books from Carl Nelson, have never looked at them since I got online access. There are many more online fiches today than when there was only realoem.com. So yeah, I get a part number for my E9, E32, K100RS, E30, whatever, then paste it into google search and see what comes up. Most times it's back to the usual three vendors, but it's interesting to see who will come up sometimes.
AND ONE MORE MATTER OF SUBSTANTIAL IMPORT... the fiche and the orange books are parts lists. They MAY show the correct relative positions of parts in a common assembly but they are NOT assembly diagrams...though many of us, me included, may/could/would/do regard them as such.