[KLF] Rarest CD?

I can't help noticing that "What Time is Love Story" and "Space" CDs seem to be changing in price from week to week on ebay, sometimes for £100 and sometimes for £35. With that in mind, I wondered what was actually the rarest CD album by the KLF and related? Which was had the most limited number of copies? Shag Times; Shag Times (Swiss); History of the JAMs; History of the JAMs (long box); History of the JAMs (Possum); Eternity - Project One; What Time is Love Story; Chill Out (UK); Chill Out (JAMSCD890005); Chill Out (long box TVT); Space; Mu; Waiting for the Rights of Mu (grey cover) Just wondered ... John