The MSI Wind U120 with a six-cell battery dips slightly below $300 after a $10 mail-in rebate good until the end of the month. Amazon currently has a $20 price break on the machine, bringing the price to $309.99 before the rebate.
The U120 features standard netbook specs: 1.6GHz Atom CPU, 1GB of RAM, 160GB SATA hard drive, Windows XP, 10.1-inch backlit LED screen with 1024×600 resolution, six-cell battery, webcam, Wi-Fi, and weighs just 2.3 pounds. All in all, a pretty good deal on a relatively popular offering from MSI.
MSI Wind U120 [Amazon]