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Dell has the Dell Inspiron 530 Core 2 Quad 2.4GHz 3GB RAM, 500GB SATA, 16x DVD+/-RW Drive, for $499 with free shipping.
Final Price for this deal: $499 + $29.99 Shipping

Description:
Intel Core 2 Quad Processor Q6600 (8MB L2 cache,2.4GHz,1066FSB)
Genuine Windows® XP Home Edition
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