Take a close look at
http://www.dell.com/content/products/productdetails.aspx/laptop-inspiron-9?c=us&cs=19&l=en&s=dhs

1GB RAM instead of 512MB and 16GB SSD disk instead of 8GB costs 50 dollars extra, with both options including Microsoft Windows.

8GB SSD disk instead of 4GB SSD disks and Micorsoft Windows instead of Linux costs 50 dollars extra.

In other words, Dell not only includes the Microsoft Windows price in the Linux configuration, but they actually charge MORE for the Linux configuration. In addition, customers who pick Linux have to accept a delay of 15 days.