The dm1 I mentioned was less than $300 months ago (quite a while actually).
Basically like a netbook but slightly better.
11.6" led screen (1366 × 768), Radeon HD 6320, can run 8GB max DDR3 (shared), 320GB HDD, win7 64bit, wlan & bluetooth.
No optical drive of course. And the intel versions of this model aren't as good: onboard graphics is inferior plus it can only take 6GB max (which is shared anyway).