I think that the best way to get an impression of what the professor considers normal prices is to look at his last book: "Books in the Digital Age: The Transformation of Academic and Higher Education Publishing in Britain and the United States", published: June 13, 2005, prices from Amazon.
Hardcover:
Amazon Price: $95.95
New from: $74.98
Used from: $74.98
Paperback:
Amazon Price $26.36
New from: $23.75
Used from: $20.75
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