On the other hand, rather than waiting for producers and marketeers to come up with an audio tape, you could create readings yourself.
Some of us did that a year ago last winter in a Yahoo group chat. We choose a chapter and assigned/volunteered/dragooned various people to read parts, along with a role for the narrator. Some chapters lend themselves better than others to this, depending on the particular mix of dialogue and narrative. We didn't do the entire book, just several chapters over a few bleak winter Sundays. Still, it was a hoot and we discovered just who amongst us are closet ham actors.