"The Making of a Fly" - a book about the molecular biology of a fly from egg to fully-fledged insect was advertised on Amazon for $23.6m (£14.3m).
(Now, I'm sure it is a fabulous book, but did it really deserve such a high price tag? No, it didn't. It hit that figure briefly on the Amazon site after the algorithms used by Amazon to set and update prices started outbidding each other. Yes, an algorithm written by a human went haywire. An amusing insight into the chaos that may be caused if we put all our trust in the machines we use every day.)