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PCConnection.com has the ThinkCentre A55 1.6GHz Pentium Dual Core 512MB RAM 160GB hard drive for $399 with Free Shipping.
Final Price for this deal: $399 + Free Shipping

Description:
* 1.6GHz Intel Pentium Dual Core E2140 / 512MB DDR2 SDRAM / 160GB Hard Drive / DVD/CD-RW Combo
* Intel Graphics Media Accelerator 3000 / Gigabit Ethernet
* Win XP Pro / 1 Year Warranty

Outfitted with Intel processors, the ThinkCentre A55 provides impressive multitasking performance. And with a host of unique ThinkVantage Technologies and design features, this competitively priced desktop combines robust security with outstanding quality to deliver exceptional overall value.