So far a season 4 and 5 have been booked but I am not sure about any others. Let's hope that there are many seasons to come on this brilliant show! Hope this helps
xxxxx
Edit:
Despite Eric Kripke's original plan to limit "Supernatural" to five seasons, the show has been picked up for a sixth season as of Februrary 16, 2010. Jensen Ackles and Jared Padalecki are both on a six year contract for the show and will definitely be apart of season six.
The CW has all the old Supernatural episodes for free, and it is legal.
Most likely
kansas- carry on my wayward son
It never matters what you give them.
Supernatural is free on Vudu and The CW. These are also legal sites.
What? No! You mean The CW TV show "Supernatural"? Of course not! They're currently going strong on their 7th season.
Supernatural is still going, it hasn't been cancelled.
Unfortunately, from my searches there is no official soundtrack for Supernatural. Disappointing i know. :) Fortunately on the Supernatural CW website you are likely to find a list of the songs for specific episodes.
Vudu and The CW both have them free and legal.
The CW is playing re-runs of season 8. Season 9 begins Tuesday, October 8th 9/8c on the CW.
Supernatural is an American supernatural drama television series created by Eric Kripke, which debuted on September 13, 2005 on The WB, and is now part of The CW's lineup.
The 4th season of Supernatural premiers Thursday, September 18th at 9/8 central.