I could not get the volumes 4-6 in Berlin, or they would have been too expensive back then, so I had them on my shopping list when I had a vacation in London and literally stumbled over Forbidden Planet by mistake as I took a right turn instead of a left turn (I was walking
) and there it was and I asked if they had these books and was told that they still had a few signed copies left over from a signing session, so I carefully asked how much more these will cost and the guy laughed and gave me the wonderful info that they charge the cover price - I was so happy and spent a long time in that shop, still the old address in Oxfort Street as far as I remember...