Oh my god, if you haven't listened to the Dark Tower audiobooks read by Frank Muller and George Guidall then that should be your next listen. Muller reads some of the earlier books in the series and then Guidall reads the rest. This saga is some of their finest work.
If you don't feel like embarking on an epic journey with the Dark Tower Saga then I'd suggest listening to short stories on Youtube. I recently listened to H.P. Lovecraft's best works on a channel called "Intellectual Exercise". A man named Conrad Feininger reads most of the stories and his voice is perfect for Lovecraft. It's some of the creepiest stuff you'll ever hear.
There's also a channel called "Horror Babble" that is pretty decent when it comes to short stories.