this is from dvd.ign.com
Do you have any info about the release of the Seinfeld TV series on DVD?
Jeremy Responds: Unfortunately, it's doubtfull we'll ever see Seinfeld on DVD. TBS, who runs the show in syndication, just recently paid more than $200 million for the exclusive rights to the series through 2011. It's doubtful that the studio that owns the show would want to jeopardize that much money by releasing it on DVD.