Northwestern owns thousands of scripts. Look them up by author/title in NUSearch.
Monologue books are also available. Search NUseach: book tab, Advance Search, Subject: monologues.
There are a number of books containing monologues. Search for Monologues using NUsearch's Subject Browse . We have a 4 volume set of scenes for actors: The Ultimate Scene Study Series on 3 South in the library: 808.82.U47.