Click here to go the merchant's page.
Dell Small Business has the Vostro 1000 AMD Dual Core TK-53 1.7GHz X2 1GB/120GB 15.4" Widescreen Laptop (Windows XP Home Edition) for $400 + applicable taxes with Free Shipping.
They also have the Windows Vista Home Edtion available for the same price.

Specs:
AMD AthlonTM 64 X2 Dual-Core processor TK-53 (1.7GHz/512KB)
Genuine Windows XP Home Edition
15.4" Wide Screen XGA LCD Anti-Glare Display
1GB Shared Dual Channel DDR2 SDRAM at 533MHz, 2 Dimm
120GB 5400RPM Hard Drive
8X DVD+/-RW w/Double-layer DVD+R Write Capability, for Vista OS
ATI Radeon Xpress 1150 256MB HyperMemory (integrated)
Dell Wireless 1390 802.11g Wi-Fi Mini Card
Final Price for this deal: $400.00