Amazon’s $23,698,655.93 book about flies

Michael Eisen, an evolutionary biologist spots The Making of a Fly, a book about genetics of animal design, on Amazon selling for US$23,698,655.93! He has an explanation: "I learned that Amazon retailers are increasingly using algorithmic pricing with a number of companies offering pricing algorithms/services to retailers." I think they have taken down the listings but I did find one that costs US$976.98.