Can you imagine, the netbook bestseller 2008, Acer Aspire One 8.9-inch display for less than 250 US dollars???
Acer Aspire One AOA110-1834 8.9-Inch Copper Netbook - 3 Cell Battery at the time of writing for only $238.99 (Amazon)!!!
Main characteristics are the 8.9 display and the good keyboard. The little price is due to the market shift towards 10-inch display and because of the new Acer Aspire One D150, a good 10-inch netbook for about $350 US dollars: for example Acer Aspire One AOD150-1669 10.1-Inch Seashell White Netbook - 6 Cell Battery
for $345.99 US dollars (Amazon).
In the meantime a surprice from MSI: the MSI Wind U100 for about $300 UD dollars (with only 3-cells battery) MSI Wind U100-641US 10-Inch Black Netbook - 3 Cell Battery