A Can't-Turn-It-Down Offer From Amazon.com:
The Theory of Moral Sentiments Or, an Essay Towards an Analysis of the Principles, by Which Men Naturally Judge Concerning... by Adam Smith ...List Price: $30.00
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UPDATE: Teresa Nielsen Hayden has a more systematic view. She points out that "For some while now Amazon has been recommending Sex and the City--The Complete Third Season! as the obvious complement to all the works of H. W. Fowler, who as you know Bob is the author of the cranky and magisterial Dictionary of Modern English Usage. You can buy the two together for just $47.83..."
Originally posted on June 11, 2002.