What about charging a few bucks for an audio download version of the orignal? I still have not heard your voice BA.
Most everyone has a burner now and there is, likely, some service that could accomodate this idea. You might want to add a bonus section of recorded Bad Astronomy sessions you recently have added to the forum.
I paid about $30 for Bryson's 5 cd's and I am now on my 3rd round. For those who travel, like me, it beats today's music and talk shows.