John Gibbon's Get a Grip on Physics is 75$ on Amazon but 5$ on Better Books
70$ added because it was in Tiger Wood's car.
In A Short History of Nearly Everything, Bill Bryson quotes from "a book by a geologist named Charles Hapgood" - The cheapest copy of that book is now 300$ (instead of 5$). (By the way - that author was a historian, not a geologist.)
In the same chapter(12), Bryson also quotes from a textbook. The edition quoted sells for 37$. Previous or later editions are 1.99.
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