Alternatively, there are these devices: http://en.wikipedia.org/wiki/Skytone_Alpha-400. These are MIPS-based (still a nice ISA), can run Linux and are the cheapest netbooks you can get. The best bet for getting one is to try an online auction site such as eBay and try searching for "MIPS", or the names that these cheapo devices go under.
Some of my readers ask me what a "Serial Port" is. The answer is: I don't know. Is it some kind of wine you have with breakfast?