All of the 'Avatar the Last Air Bender' seasons and episodes can be found on Amazon Prime.
If you want to watch it online then http://www.surfthechannel.com/ is a good place.
Youtube
www.freeavatarepisodes.net
It originally aired September 23rd, 2005
on netflix
Avatar: The Last Airbender Book 3 - Chapter 16 "The Southern Raiders" first aired in the US on July 17, 2008.
it is not coming out becaus the writters suck horese cock.
Avatar's page on Nick.com. It's under "episode guide."
Avatar: The last air-bender movie 1 came out on June 30, 2010.
Aang's dream? If you are refering to Nightmares and Daydreams then it is chapter 9, season three.
You can get "Avatar: The Last Airbender" episodes on iTunes.
go to youtube.com just type in avatar the last airbender episodes and from there it should give you links to some different sites.