By Brian Stelter, CNN Senior Media Correspondent
Hachette books aren't the only products that are now harder to order on Amazon - the online retailer is going after movies, too.
Amazon (Tech30) has turned off the preorder function for DVDs of prominent Warner Bros. films as it seeks to raise pressure on the company during negotiations.,
"The Lego Movie," for example, is listed as "currently unavailable" on Amazon. Set for release in the home video marketplace on June 17, there is no option to place a preorder.
Warner is owned by Time Warner (), the parent company of CNNMoney.