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• Involved by Kate O'Riordan Flamingo Paperback 18 August 1997 from£8.08 | RRP: £5.99
• Irish Guardianship Law and Practice by Anne-Marie O'Neill Bloomsbury Professional Hardcover 30 November 2011 from£168.75 | RRP: £125
• Decision-making in Social Work by Terence O'Sullivan Palgrave Macmillan Paperback 17 September 1999 from£32.38 | RRP: £22.99
• Mrs Frisby and the Rats of NIMH (Puffin Modern Classics) by Robert O'Brien Puffin Classics Paperback 6 October 1994 from£8.08 | RRP: £5.99
• The Healing Code: One Man's Amazing Journey Back to Health and his Proven Five-Step Plan to Recovery by Dermot O'Connor Hachette Books Ireland Paperback 1 June 2006 from£14.83 | RRP: £10.99
• Othello (New Longman Shakespeare Series) by Mr John O'Connor Longman Paperback 10 January 2003 from£9.11 | RRP: £6.5
• Thunderhead by Mary O'Hara Mammoth Paperback 15 February 1979 from£2.63 | RRP: £1.95
• Cowboys and Indians by Joseph O'Connor Vintage Paperback 1 May 2008 from£9.99 | RRP: £7.99
• The Executive's Compass: Business and the Good Society by James O'Toole OUP USA Paperback 24 August 1995 from£15.23 | RRP: £12.99
• Island of the Blue Dolphins (Puffin Books) by Scott O'Dell Puffin Paperback 29 August 1996 from£9.43 | RRP: £6.99
• Rough Justice by Gilda O'Neill Arrow Books Ltd Mass Market Paperback 15 March 2007 from£22.93 | RRP: £5.99
• Lands Never Trodden: The Franciscans and the California Missions by John J. O'Hagan Caxton Press Paperback 25 July 2013 from£18.88 | RRP: £13.99
• OCA Oracle Database SQL Certified Expert Exam Guide (Exam 1Z0-047) (Osborne Oracle Press Series) by Steve O'Hearn McGraw-Hill Osborne Paperback 1 January 2010 from£44.45 | RRP: £44.99
• Amedeo: The True Story of an Italian's War in Abyssinia by Sebastian O'Kelly HarperCollins Paperback 19 May 2003 from£11.59 | RRP: £9.99
• The Cancer Roadmap: Real science to guide your treatment path by O’Riordan, Dr Liz Thorsons Paperback 30 January 2025 from£13.57 | RRP: £
• Out of the Blue: Pilot with the Chindits by Terence O'Brien Arrow Books Ltd Paperback 17 November 1988 from£5.38 | RRP: £3.99
• None of My Affair by Fiona O'Brien Hodder Paperbacks Paperback 16 April 2009 from£9.43 | RRP: £6.99
• Critical History of Western Philosophy by D.J. O'Connor Free Press Hardcover 1 December 1964 from£29.51 | RRP: £24.95
• Environmental Science for Environmental Management by Prof Timothy O'Riordan Longman Paperback 3 October 1994 from£26.98 | RRP: £19.99
• The Men Commandments by Christian O'Connell HarperCollins Audio CD 15 September 2008 from£14.98 | RRP: £13.99
• I Blame the Scapegoats by John O'Farrell Black Swan Paperback 1 October 2004 from£12.13 | RRP: £8.99
• Lulu Goes to Witch School (I Can Read Books (Harper Paperback)) by Jane O'Connor HarperCollins Paperback 1 September 1990 from£4.35 | RRP: £2.71
• Dangerous Company: Management Consultants and the Businesses They Save and Ruin by James O'Shea Penguin USA Paperback 24 September 1998 from£13.74 | RRP: £9.46
• The Rites of Autumn: A Falconer's Journey Across the American West by Dan O'Brien Anchor Books Paperback 1 September 1989 from£9.80 | RRP: £6.9
• They Dared Return: An Extraordinary True Story of Revenge and Courage in Nazi Germany by Patrick K. O' Donnell Pocket Books Paperback 2 September 2010 from£10.78 | RRP: £7.99