There are many places on the Internet for scripts. We do not necessarily endorse or recommend any of the sites listed below in terms of being comprehensive resources. These links are provided as a starting point for your script research.
Here are a few others:
http://scriptlist.oscars.org/ - This one references paper copies of scripts housed in Seven Los Angeles-Area Libraries. (Academy of Motion Picture Arts and Sciences; the American Film Institute; the Frances Howard Goldwyn Hollywood Regional Library; the University of California, Los Angeles; the University of Southern California; the Writers Guild of America, West; and the Warner Bros. Archives at University of Southern California's School of Cinematic Arts)
Feature Films Archive (4559 titles) https://archive.org/details/feature_films
Television Archive (1,011,162 items/titles) https://archive.org/details/tvarchive
Television Archive News Search Service https://archive.org/details/tvnews
TV News Archive (955,000 since 2009) https://archive.org/details/tv
Old Time Radio https://archive.org/details/oldtimeradio