Dell Business has the Dell Precision T1650 3rd Generation Core i3 Win 8 Pro Desktop for $499 with free shipping. This is their entry-level enterprise workstation model. Upgrade to Windows 8 Professional for free. Check out AnandTech's review of an upgraded configuration.
3rd Gen Intel Core i3-3220 3.3GHz, 2GB RAM, 250GB HDD Intel Integrated HD Graphics, DVD-ROM, Win 7 Pro x64
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