I’ve mentioned Audible before, and I guess iTunes has audiobooks on their store. (Not that I’ll ever be able to tell for myself, since they still make you download software just to see the selection.) Anyway, I guess some of the other music stores also sell audiobooks, and some of them (unlike Audible) are in DRM-free formats.
EMusic has apparently been selling Random House and other audiobooks this way since 2007. If you sign up for their free trial subscription, you get 25 songs and one free audiobook as your sample. Since they’re all DRM-free mp3s, this is a good deal. So if you really are jonesing for something and are too cheap to pay full price, this seems like a decent way to manage it.
However, eMusic is surprisingly coy about pricing. You can read the current prices of their music subscription plans in the FAQ, but if you want to find out what the audiobook subscriptions cost, you have to go to an “Upgrade” page which can only be reached by registered members. It seems to be similar to Audible’s book/credit pricing scheme.