Dell is offering this Dell Studio Slim Desktop w/ 20" Monitor for $702.40, 20% off their regular price.  Use coupon code "5TK?LC9VJ5F$33" to get the discount. This system ships for Free, and it features:

• Intel Core 2 Quad Q8300 (4MB L2, 2.5GHz, 1333FSB)
• Genuine Windows 7 Home Premium, 64bit, English
• Microsoft Works 9
• 2 Year Basic Service Plan
• McAfee SecurityCenter, 15-Months
• 20" Dell IN2010N HD Monitor with VGA port and cable
• 4GB Dual Channel DDR2 SDRAM at 800MHz- 4DIMMs
• 640GB Serial ATA Hard Drive (7200RPM) w/DataBurst Cache
• 16X DVD+/-RW Drive