On the day after thanksgiving, Dell's 9" Minspiron will be $300. There's an element of "enh" to it all–I recently found the $300 EeePC to have taken a corner-cut too many for anything more than the most casual use–but it's a nicer-looking machine than the 900-series Eees and OSX installs on it relatively easily.
But not with just 512MB of RAM! Remember to check the specs.
Dell Black Friday deal: $299 Inspiron Mini 9 [Lilliputing]