DVDs Region 1 US

Season Release Date Buy Now
Season 1 (DVD) November 21 2006 Amazon.com
Season 2 (DVD) October 2 2007 Amazon.com
Season 3 (DVD) October 7 2008 Amazon.com
Season 4 (DVD) September 29 2009 Amazon.com
Season 4 (Blu-ray) September 29 2009 Amazon.com
Season 5 (DVD) September 21 2010 Amazon.com
Season 6 (DVD) September 27 2011 Amazon.com
Season 7 (DVD) October 2 2012 Amazon.com
Season 8 (DVD) October 1 2013 Amazon.com
Season 9 (DVD) September 23 2014 Amazon.com
Seasons 1 - 9 (DVD) September 23 2014 Amazon.com

DVDs Region 2 EU

Season Release Date Buy Now
Season 1 (DVD) May 7 2007 Amazon.co.uk
Season 2 (DVD) February 8 2010 Amazon.co.uk
Season 3 (DVD) May 10 2010 Amazon.co.uk
Season 4 (DVD) July 19 2010 Amazon.co.uk
Season 5 (DVD) November 8 2010 Amazon.co.uk
Season 6 (DVD) October 31 2011 Amazon.co.uk
Season 7 (DVD) October 15 2012 Amazon.co.uk
Season 8 (DVD) September 30 2013 Not Available
Season 9 (DVD) October 13 2014 Amazon.co.uk
Seasons 1 - 9 (DVD) October 13 2014 Amazon.co.uk