They didn't. They wanted to cash in on The Simpsons 20th Anniversary so they released a bare bones Season 20 on DVD & Bluray.
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In April 2015, it was announced the Simpson DVD released would be discontinued. The seasons would still be released but as digital downloads and not proper physical DVD or Blu-ray sets.
If you mean season instead of series, then yes. There are seasons 1-22. (2010)
u can't see it yet because fox obviously decided to skip to season 20 and forget seasons 13-19. u can see the simpsons season 20 box art on Amazon
The Simpsons - 1989 Dial 'N' for Nerder 19-14 is rated/received certificates of: USA:TV-PG (1997-Present)
The Simpsons - 1989 Old Yeller-Belly 14-19 is rated/received certificates of: Argentina:Atp USA:TV-PG (1997-Present)
The Simpsons - 1989 That 90's Show 19-11 is rated/received certificates of: USA:TV-14
The Simpsons - 1989 Treehouse of Horror XVIII 19-5 is rated/received certificates of: USA:TV-14
So far 19 seasons have been shown in Australia and there will be more to come. If you want to buy the seasons real cheap fly to China and you can get them for 10 Aussie dollars from seasons 1-19. I have them all. They are also in excellent conditions.
The Simpsons - 1989 Old Yeller-Belly 14-19 was released on: USA: 4 May 2003 UK: 7 September 2003 Hungary: 25 March 2004 Germany: 10 April 2004
19
You can't because Seasons 16, 17, 18 & 19 aren't out on DVD yet.You can get Season 20 because FOX decided to cash in on The Simpsons 20th anniversary by releasing a bare bones DVD and Bluray.Season 16 should be released near the end of 2013 if FOX follows the same pattern of releases they have for the last few years.
The Simpsons - 1989 Scenes from the Class Struggle in Springfield 7-14 was released on: USA: 4 February 1996 UK: 14 April 1996 Germany: 19 November 1996 Hungary: 18 February 2001
The Simpsons - 1989 Mona Leaves-a 19-19 is rated/received certificates of: Canada:PG USA:TV-PG (1997-Present)