In june, a first edition of Galileo's 1610 Sidereus Nuncius fetched more than $380,000 at a Christie's auction. The amount surprised observers who were shocked that even an eager collector with deep pockets might pay that kind of money for the historical manuscript. What is even more surprising is that booksellers Patrick Ames and John Warnock are offering the same volume for $25. And buyers won't have to worry about breaking bindings or tearing delicate pages, because the rare books Ames and Warnock sell are digital.

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