There is no 'official' DVD release available as of Oct. 17, 2010. You can sign up on amazon.com to be notified if/when it is ever released and available through them.
NOTE: There is at least one company who is selling the complete series on DVD, taken from TV broadcasts. This is not a set you want to buy, the disks will be defective and support non-existent, at an exorbitant price. Beware 'click dvd store'!