If a complete copy of the pdf is not available you might want to make a draft wip copy available for purchase. If the feedback in this thread is any indication

If a complete copy of the pdf is not available you might want to make a draft wip copy available for purchase. If the feedback in this thread is any indication I think a lot of good will come out of it. (You may also want to honor Knuth by paying people who bought the wip pdf and spotted mistakes :)