I found lots of anti-Bush books online, not sure where you can get them or buy them but here is a list:
* Eric Alterman and Mark J. Green, The Book on Bush: How George W. (Mis)leads America, (2004) ISBN 0–670-03273–5
* Ken Auletta (January 19, 2004). “Fortress Bush: How the White House Keeps the Press Under Control”, The New Yorker, LXXIX, 53
* Bruce Bartlett, Imposter: How George W. Bush Bankrupted America and Betrayed the Reagan Legacy, (2006) ISBN 0–385-51827–7
* Paul Begala, Is Our Children Learning?: The Case Against George W. Bush, (2000) ISBN 0–7432-1478–1
* Paul Begala, It’s Still the Economy, Stupid : George W. Bush, The GOP’s CEO, (2002) ISBN 0–7432-4647–0
* John Bonifaz, Warrior King: The Case for Impeaching George Bush, (2003) ISBN 1–56025-606–0
* James Bovard, The Bush Betrayal, (2004) ISBN 1–4039-6727-X
* Russell S. Bowen, The Immaculate Deception: The Bush Crime Family Exposed, (1991) ISBN 0–922356-80–7
* Robert Bryce, Cronies: Oil, The Bushes, and the Rise of Texas, America’s Superstate, (2004) ISBN 1–58648-188–6
* Robert C. Byrd, Losing America: Confronting a Reckless and Arrogant Presidency, (2004) ISBN 0–393-05942–1
* Richard Clarke, Against All Enemies : Inside America’s War on Terror, (2004) ISBN 0–7432-6045–7
* David Corn, The Lies of George W. Bush: Mastering the Politics of Deception, (2003) ISBN 1–4000-5066–9
* John W. Dean, Worse Than Watergate: The Secret Presidency of George W. Bush, (2004) ISBN 0–316-00023-X
* Robert S. Devine, Bush Versus the Environment, (2004) ISBN 1–4000-7521–1
* Maureen Dowd, Bushworld: Enter at Your Own Risk, (2004) ISBN 0–399-15258-X
* Dr. Justin A. Frank, Bush On The Couch: Inside the Mind of the President, (2004), Regan Books. ISBN 0–06-073670–4
* Al Franken, Lies and the Lying Liars Who Tell Them: A Fair and Balanced Look at the Right, (2003) ISBN 0–525-94764–7
* Al Franken, Still More George W. Bushisms: Neither in French nor in English nor in Mexican, (2003) ISBN 0–7432-5100–8
* Ben Fritz, Bryan Keefer & Brendan Nyhan, All the President’s Spin: George W. Bush, the Media, and the Truth, (2004) ISBN 0–7432-6251–4
* James Hatfield, Fortunate Son: George W. Bush and the Making of an American President, (1999) ISBN 1–887128-84–0
* Jack Huberman, The Bush – Haters Handbook: A Guide to the Most Appalling Presidency of the Past 100 Years, (2003) ISBN 1–56025-569–2
* Molly Ivins, Bushwhacked : Life in George W. Bush’s America, (2003) ISBN 0–375-50752–3
* Molly Ivins and Lou Dubose, Shrub: The Short but Happy Political Life of George W. Bush, (2000) ISBN 0–375-50399–4
* Patrick S. Johnston, Mission Accomplished (Novel), (2006) ISBN 1–59858-244–5
* William Karel, The World According to Bush, (2004) documentary
* Robert F. Kennedy Jr., Crimes Against Nature: How George W. Bush and His Corporate Pals Are Plundering the Country and Hijacking Our Democracy, (2004) ISBN 0–06-074687–4
* Mark Crispin Miller, The Bush Dyslexicon: Observations on a National Disorder, (2002) ISBN 0–393-32296–3
* Mark Crispin Miller, Cruel and Unusual: Bush/Cheney’s New World Order, (2004) ISBN 0–393-05917–0
* Michael Moore, Dude, Where’s My Country?, (2004) ISBN 0–446-69379–0
* Michael Moore, Stupid White Men, (2004) ISBN 0–06-098726-X
* Michael Moore, Fahrenheit 9/11 (2004) motion picture
* Jack Nargundkar, The Bush Diaries: A Citizen’s Review of the First Term (2005) ISBN 0–595-35898–5
* Kevin Phillips, American Dynasty: Aristocracy, Fortune, and the Politics of Deceit in the House of Bush (2004) ISBN 0–670-03264–6
* Carl Pope, Strategic Ignorance : Why the Bush Administration Is Recklessly Destroying a Century of Environmental Progress, (2004) ISBN 1–57805-109–6
* Gabriel Range, Death of a President (2006) motion picture
* Webster Griffin Tarpley and Anton Chaitkin, George Bush: The Unauthorized Biography ([1]
* Michael Scheuer (orig. pub. under “Anonymous”), Imperial Hubris: Why the West is Losing the War on Terror, (2004) ISBN 1–57488-849–8
* Glenn W Smith, Unfit Commander: Texans for Truth Take on George W. Bush, (2004) ISBN 0–06-079245–0
* Craig Unger, House of Bush, House of Saud: The Secret Relationship Between the World’s Two Most Powerful Dynasties, (2004) ISBN 0–7432-5337-X
* Paul Waldman, Fraud: The Strategy Behind the Bush Lies and Why the Media Didn’t Tell You, (2004) ISBN 1–4022-0252–0
* Ian Williams, Deserter: George Bush’s War on Military Families, Veterans, and His Past, (2004) ISBN 1–56025-627–3
* Clint Willis, The I Hate George W. Bush Reader: Why Dubya Is Wrong About Absolutely Everything, (2004) ISBN 1–56025-589–7
* Bob Woodward, “State of Denial”, (2006)
Lots of these are actually on http://amazon.com and maybe your local library has a few.