BooksUpdated: August 15th, 2005
Amazon
Has 64 City related books listed. Detailed reviews of many of them can be found at MCIVTA
For non City books sportsbooksdirect has more than 1,600 football titles broken down into 43 categories. Also worth trying are football-books.com and soccer-books.co.uk which both have searchable catalogues.
Once you know what book you want addall.com will search all the online stores for the cheapest new and used copy.