Librivox! When I taught high school English I used this resource all of the time. The website uses volunteers to record readings of books that are now in the public domain. No, you won’t find the newest, must-have books on this site, but you will find many of the classics including Shakespeare’s plays.
This website was a life-saver for a couple of my tenth grade students who read at a fifth to sixth grade level. As a modification, I had them download some of our stories from Librivox with the caveat that they must follow along in their books when listening.
So visit their site here Librivox and search through their catalog. You can even volunteer to read a book if you’d like!