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Dell has the Optiplex 330 Desktop: Core 2 Duo, 19" WFP Monitor, 160GB HD, 1GB Memory, DVD-ROM, Windows XP Home, for $449 with free shipping.
Final Price for this deal: $449 + Free shipping

Description:
Intel® Core™ 2 Duo Processor E4500 (2.2GHz, 2M, 800MHz FSB)
Genuine Windows® XP Home Edition,SP2, x32, with Media, English
1.0GB DDR2 Non-ECC SDRAM, 667MHz, (1DIMM)
160GB SATA 3.0Gb/s and 8MB DataBurst Cache™
16X DVD-ROM SATA, Cyberlink Power DVD™
Integrated Video, Intel® GMA3100
Dell 19 inch E198WFP Widescreen Flat Panel, Analog
Dell Energy Smart Enable
NTFS File System for all Operating Systems
Resources CD contains Diagnostics and Driver for Dell OptiPlex Systems