Where can I get the old book 'Mind games'?

A book that was forwarded by John Lennon and other Beatles - published late 60's-early 70's dealing with the normality of the psychic experience and exercises within the grey area of dark and unexplained activities including visual regression with a candle and two people in a dark and silent room - "who was I yesterday and who will I be tomorrow and jesus it works!" Oldie now at turned 60 would lioke to enpower someone with the knowledge of the other things in the book - good price paid for a fair copy!