Three publishers will drop the agency model that kept eBook prices the same across all marketplaces, and the eBook price wars have already commenced. PaidContent confirmed yesterday that HarperCollins prices have already started to change.

Last week, a federal judge approved a settlement between between Hachette Book Group, Simon & Schuster and HarperCollins and the Department of Justice. Soon eBook marketplaces can sell some digital books at a discount, reigniting the eBook price wars.

Prices on Hachette and Simon & Schuster digital books still contain the “This price was set by the publisher” tag on Amazon, but their price restrictions will also be lifted as part of the agreement. In the meantime, we took a look at the most expensive books from these publishers–a way to track the changes in agency model books.

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