Although there are many places to obtain a monologue, here are just a few. If you know of any we should share, please let us know.
http://www.imsdb.com
Drews Script-o-Rama. The place you know and love for free scripts and screenplays
SimplyScripts - links to hundreds of free, downloadable scripts, movie scripts, screenplays, and transcripts of current, classic and maybe a few soon-to-be-released movies, television, anime, unproduced and radio shows