Survivor: Heroes vs. Villains was released on DVD on February 22, 2011.
Heroes - 2006 II Chapter Eight 'Villains' 3-8 is rated/received certificates of: Netherlands:12 Netherlands:16 (DVD rating) USA:TV-14
They will eventually all be released on DVD. They tend to release the seasons based on popularity.
Yes, it has been released.
As of September 2011, season 16. Survivor: Fans vs. Favorites, has not been released on DVD. However, you can download this season on Itunes.
When Heroes Die - 2007 was released on: USA: 1 June 2007 (DVD premiere)
Young Heroes - 2007 was released on: USA: 12 June 2007 (DVD premiere)
It's released right now. It is in the same edition as season 3.
Necessary Evil Super-Villains of DC Comics - 2013 was released on: USA: 25 October 2013 (DVD premiere)
There hasn't been an official release date for Heroes Volume 3: Villains on DVD yet.... Since Season 3 hasn't finished yet on TV, they will probably release it on DVD along with Volume Four: Fugitives, once this volume has finished. But, my guess is before September, since Season Four will surely be coming on TV in September 2009.
July 28 2008
AFK Heroes of Prophecy - 2012 was released on: USA: 30 June 2012 (DVD premiere)