Cambridgeshire Library Service provides us with our books.  Since we are a relatively large group (15 currently), it would be rare that the library service would hold that many copies of a single title.  For this reason, we have opted to have 2 titles per month.  A benefit of having 2 titles on offer is that when we find there is a largely positive review of a book, those who have not read it can easily borrow it until the next meeting.  Here are more that at least some of us have read in the last few years.