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Dell has the Inspiron 530 Intel Core 2 Quad Processor Q6600 2.4GHz 3GB 500GB SATA DVD+/-RW for $431 with free shipping.
Get 10% off coupon (use multiple email to get it) at this link
Choose Windows XP home edition or Vista Home Premium.
Apply the 10% coupon at checkout.
Final Price for this deal: $809 - $310 (instant savings) - 10% coupon - auto 4% off in cart = $431

Description:
* Intel Core 2 Quad Processor Q6600 (8MB L2 cache,2.4GHz,1066FSB)
* Genuine Windows Vista® Home Premium
* No Monitor
* 3GB Dual Channel DDR2 SDRAM at 667MHz - 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