The 40% in a vacuum does not really complete the picture for me. Is it possible to get the same book at a lower price somewhere else? If it were the case why wo

The 40% in a vacuum does not really complete the picture for me. Is it possible to get the same book at a lower price somewhere else? If it were the case why would there not be other retailers undercutting Amazon? Maybe I am missing some monopoly related issue here, but I would love to know more.