Yep, the new paperback curry heaven book is £4.95. There is an old hardback curry feast book which is not published any more but as a guide - paperbacks are a fiver and hardbacks a tenner at group.
Some consultants don't keep the books in stock (usually because they have no space at home to keep them), but they will always order a copy for you, and there should be one you can look at.
Our consultant keeps very little in stock, but there is a class copy of every book on the central table so we can look through them and decide whether to order one.