A surprising number of these are available on YouTube as audiobooks. I have listened to “At the Earth’s Core”, “The Face in the Frost”, five of the Elric stories, “The Eyes of the Overworld”, “Burn, Witch, Burn!”, and am currently listening to “At the Mountains of Madness”.
I’ve been listening to “The Appendix N Book Club” on Spotify. The hosts discuss the stories, and how they relate to actually playing the D&D game. For example, they note that from “Burn, Witch, Burn!”, we get the charm and silence spells.