The National Library Service digitized the old old cassette I read in the early 90's. Your tax dollars at work, I guess. That option is not immediately available to you, though I'd be surprised if there aren't used copies floating around on Amazon. Back to the NLS, though -- their services are available to persons with "print disabilities," so they may be available to your eldest, depending on his diagnoses. The library is becoming more and more liberal in its coverage, or so I hear.