The Asus AsusPro B43A is a great business laptop for under $400. Featuring a sturdy frame, anti-shock hard drive, a spill-proof keyboard, an aluminum alloy construction on the cover, and keyboard, which makes it several times sturdier than conventional plastics. This laptop is built to last and handle everyday usage.
Power adapter included.
Notes: These laptops have some dents on the LCD lid. They have been discounted. See the example photos above.