Ultraportable

I'm looking to buy a cheap ultraportable laptop. Something just to use for web-browsing, word processing, and probably listening to some music, maybe play a few DVDs.
I'm looking for something cheap too, like under $400. I'd like an internal DVD or CD drive, but it's not essential; I can always use USB drives and rip stuff to .avi.

What specific brands/models should I look for, and where can I find them?

>>3

I'm not looking for a new one. I'm aiming for <1Ghz cpu, <20GB HDD, and <256mb RAM.

So far, eBay looks like my best bet with a bunch of old Vaios for under $300.