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Dell.com has the Dell Inspiron 530N Pentium dual-core 2.00GHz 2GB 250GB DVD+/-RW, for $239.
Final Price for this deal: $239 + $35 shipping

Description:
* Intel® Pentium® dual-core processor E2180 (1MB, 2.00GHz, 800FSB)
* Ubuntu 8.04 with DVD Playback
* No Monitor
* 2GB Dual Channel DDR2 SDRAM at 800MHz- 2DIMMs
* 250GB Serial ATA Hard Drive (7200RPM) w/DataBurst Cache™
* 16x DVD+/-RW Drive
* Integrated Intel Graphics Media Accelerator 3100
* Integrated 7.1 Channel Audio
* Dell USB Keyboard and Dell Optical USB Mouse
* No Floppy Drive Included