This deal has ended.
Dell Small Business has the Dell Vostro 200 Mini Tower for only $399 after $210 in instant savings. This features a 19" LCD monitor, 1.8GHz Intel dual-core processor, 1GB memory, 160GB hard drive, 16x DVD player (upgrade to a CD / DVD burner for $30) and Windows XP or Vista Home Basic (I recommend XP, Vista isn't perfected yet). Upgrades are available for most components (just scroll across the icons at the middle of the landing page). Shipping is free and sales tax is charged in most states.