"The Big Book Of United", "Manchester The City Years", "Manchester A Football History" and "Joe Mercer, OBE: Football With A Smile" are all currently available in hardback from Waterstones, Amazon, the Book Depository and direct from James Ward. See http://manchesterfootball.org/publications.php for book details.
A text only version of "Joe Mercer, OBE: Football With A Smile" is available for the Kindle and some sections of "Manchester The City Years" and "The Big Book Of City" are also available for the Kindle. See http://manchesterfootball.org/ebooks.php for more details.
The hardback edition of "The Big Book Of City" has now sold out.