Apparently Beast Wars II was released in Japan last year on DVD, so with the impending release of BWNeo later this year on DVD, that would effectively cover all of the major TFs cartoon series on DVD now.
Release date of 26th September.

Now, if only Shout or Madman would release them with subtitles... that'd make my day, as I'd love to watch the series I have so many wonderfully engineered toys from.