try:
http://www.fredwilsonchess.com/books.php
http://www.chessbooks.co.uk/ is Tony Peterson. I got MCO4
from him in very good condition at a very fair price, but he doesn't have any of the earlier ones. I looked at the other web site noted, but didn't find anything. If any other source occurs to you, please let me know.
Well, after only six years, I've got the second edition. Now looking for the first and third editions (realizing that the first edition is very scarce).
They don't have to be great - just decent. Thanks, Grzenda