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Dell has the Dell Inspiron 530s Core 2 Duo 2.20GHz, 1GB, 250GB Desktop PC for $319 + $29.99 shipping.
Select Intel® Core™2 Duo Processor E4500 (2MB L2 Cache,2.20GHz,800 FSB) [subtract $10].
Final Price for this deal: $319 + $29.99 shipping

Description:
* Intel® Core™2 Duo Processor E4500 (2MB L2 Cache,2.20GHz,800 FSB)
* Genuine Windows Vista® Home Basic - English
* No Monitor
* 1GB Dual Channel DDR2 SDRAM at 667MHz- 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
* 56K PCI Data Fax Modem