Dell n Series Desktops: I didn’t know about these.
The n Series features select popular models from the Dimension , OptiPlex and Dell Precision desktop lines sold without a Microsoft operating system. Offered for IT professionals who want control over operating system development and installation, n Series desktops are available with a copy of the FreeDOS open-source operating system included in the box, ready to install. Select n Series systems are also available with Linux.
A bargain basement n Series without an OS is $319. A bargain basement Dimension (with XP), is $349.