Well, they've got the three-volume HOLLOW REED up on Smashwords and a lot of other venues. It took forever: issues of copyright, problems with font size on the title page, problems with centering, potential problems with tab keys, my retyping a title page and getting the date wrong, devising blurbs no longer than 400 characters counting spaces, etc. etc.
But I've taken the first step in electronic publishing, and they made samples available. Now let's hope for the best.
My thanks to the lovely people here who helped me with advice! I couldn't have done this without you (and someone at my agent's office who struggled mightily with Smashwords and will soon struggle with Amazon DTP).