LibriVox ( https://librivox.org/ ) has free audiobooks for many of these public domain books. They're recorded by volunteers, so the quality is a grab bag. Some of them are quite good though. Most recently I listened to A Connecticut Yankee in King Arthur's Court read by John Greenman ( https://librivox.org/a-connecticut-yankee-in-king-arthurs-co... ) Goofy book, but very entertaining.
As you mentioned, the quality varies, but some are real gems. My personal favorites are the Jeeves stories narrated by Mark Nelson:
https://librivox.org/my-man-jeeves-by-p-g-wodehouse/
https://librivox.org/right-ho-jeeves-by-p-g-wodehouse/
Also, the whole LibriVox collection is uploaded to the Internet Archive (easy to find: it’s one of the top links under the audio tab). IA’s interface is nicer in certain ways than librivox.org due to its options for searching, sorting (e.g., by views), and listening in the browser. https://archive.org/details/librivoxaudio