Have you ever posted a wanted list on the newsgroups? Use a special email address because it will be spammed from people mining newsgroups for valid email accounts.
Worked for me a few times, and people dont rip you on postage most of the time. I was getting a few responces a day for a week when I posted about wanting an ISA video card and other stuff. there are always a few jokers who try to sell stuff 2-3x what others sell it for. I ended up getting all of my amiga manuals for cheap from newsgroup people.