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Amazon recently took early nickelodeon shows off of prime, but you can buy some of the first episodes for free

Avatar:
http://www.amazon.com/gp/product/…lpage_o00_

Invader Zim:
http://www.amazon.com/gp/product/…lpage_o01_

Rugrats:
http://www.amazon.com/gp/product/…lpage_o02_

Rocket Power:
http://www.amazon.com/gp/product/…lpage_o03_