Below are a few websites where you might find a monologue.  Be sure to choose one that not only fits the audition parameters, but also fits you!  Monologues can be found in books, movies, and t.v. shows.  The best place to find them is scripts.  My general rule is that if you can't name the person who wrote it and the play/book/movie it came from, DON'T USE IT!  Once you've found one, TIME IT and PRACTICE IT!  Never audition with an unrehearsed monologue.
https://stageagent.com/monologues

https://www.dailyactor.com/contemporary-monologues/

https://www.stagemilk.com/monologues-for-actors/