Supernatural Season Four DVD and Blu-ray are out today, September 1, 2009.
The DVD and Blu-ray include:
* Season Four's 22 Episodes
* The Mythologies of Supernatural: From Heaven to Hell – Three sections featurette gallery bridging Heaven, Purgatory and Hell to examine key methological precepts
* Commentary on 3 Key Episodes by Executive Producers and writers
* Extended/Unaired scenes
* Gag Reel
Target are adding an exclusive separate 45 minute Q&A bonus disc from 2008 Comic Con panel to the Supernatural Season Four DVD set, while BestBuy have an eye-popping lenticular packaging.
Supernatural Season 4 DVD website.
Check WinchesterBros.com Gallery for Season Four DVD Extras and Comic Con 2008 screencaps.