This deal has ended.
Through 12/5, Dell Small Business has their Vostro 200 Desktop for only $399 after $370 instant savings. This is well-configured enough for most people and relatively inexpensive if you want to upgrade (just scroll across the component icons at the middle). It comes standard with a 2.2GHz Intel Dual-Core processor, 1GB memory (upgrade to 2GB for $100), 160GB hard drive (upgrade to 250GB for $50), DVD-ROM drive (this only reads CDs / DVDs; upgrade to a DVD+R for $70), Windows XP or Vista Home (I recommend XP, Vista isn't perfected yet), and a 17" flat-panel monitor (upgrade to 19" for $20). Shipping is free.