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Dell.com has the Inspiron 530 Core 2 Quad Processor Q6600 2.4GHz/3GB/500GB/16x DVD+-RW, for $499.
Final Price for this deal: $499 + $35 Shipping

Description:
* Intel Core 2 Quad Processor Q6600 (8MB L2 cache,2.4GHz,1066FSB)
* Genuine Windows Vista® Home Premium Service Pack 1
* No Monitor
* 3GB Dual Channel DDR2 SDRAM at 800MHz - 4 DIMMs
* 500GB 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
* No Modem Option