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Dell Small Business has the Dell Vostro 200 Mini Tower PC starting at only $419. This comes with a 20" ultrasharp Dell monitor and features a 2.66GHz Intel Core 2 Duo processor, 2GB memory (downgrade to 1GB to drop the price to $399), 250GB hard drive, 16x DVD / CD burner, and Windows Vista Home Basic. Upgrades are available for most components (just scroll across the icons at the middle of the landing page). Shipping is $35 (free if you spend $499) and sales tax is charged in most states.