Just six months ago, Michael Phelps had more Olympic gold around his neck than anyone else in history. Signed copies of his first book, Beneath the Surface, were going for $300 a pop. The News of the World and a picture of Phelps with a bong soon took the shine off those medals. There are plenty of signed copies of his latest book, No Limits, on AbeBooks but I’d be surprised if people are willing to today’s prices, which stretch to $245.