dm4hire
Explorer
With the exception of eBay, the other places may only be listing them high as a place holder for when/if they ever get the book in stock. Saves on having to relist all the details they would have to take down due to not having the book, so by jacking it up to a price no one wants to pay they can keep the listing at no extra expense then when they get a copy they can just set it back to the correct or more reasonable price. In the mean time if someone actually tries to buy it they can then say either sorry we're out or actually buy the book somewhere else cheaper and fill the order making a profit.