Various models of the iPod, on the other hand, were among the top sellers, along with Canon Powershot Digital Elph Cameras and Garmin GPS devices, Amazon said Tuesday.
In the home computer category, the Apple MacBook 13.3-inch notebook in white and black was the top seller, along with the Sony Vaio 15.4-inch notebook.
Amazon is the largest online-only retailer.
Zune sales dropped significantly after a successful launch week. For the first four days following the Nov. 14 launch, Zune accounted for 9% of unit sales and 13% of revenue in the portable media player market, according to the NPD Group. The device held the No. 2 position during that time, just ahead of SanDisk but well behind the iPod, which grabbed 63% of unit sales and 72.5% of revenue.