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Dell has the Vostro 200 Mini Desktop with Dual-Core CPU, 1GB, 80GB & 20-inch LCD Monitor for $434. Select Add 20-inch for $15
Final Price for this deal: $434 + Free Shipping

Description:
Intel® Pentium® Dual-Core E2160 (1.80GHz, 1MB L2 Cache, 800FSB)
Genuine Windows® XP Home Edition
1 Year Basic Limited Warranty and 1 Year NBD On-Site Service
Dell 20-inch Widescreen Flat Panel Monitor
1GB Dual Channel DDR2 SDRAM 667MHz - 2DIMMs
Single Drive: 16X DVD-ROM Drive
80GB Serial ATA Hard Drive (7200RPM) w/DataBurst Cache™
Intel® Graphics Media Accelerator 3100
No Floppy Drive
No Modem Option
Integrated 7.1 Channel Audio
No Pre-installed Productivity Software
No Pre-installed Anti-Virus/Security Software