This deal has ended.
Update: this deal is over. Likely just for today, Microsoft Store has the 10.1" Acer Aspire One D250-1584 Netbook on sale for only $223, marking the new all-time low price. This features a 1.66GHz Intel Atom processor, 1GB of memory, 250GB hard drive, memory card reader, six-cell battery, wireless networking, Windows 7 Starter, and more. Shipping is free with sales tax charged in most states.