This, I’ve gotta try:
Build a three-screen workstation for $230 or less. … This involves taking the video output of a laptop and running through a widget that gives you two (or four, for a bit more money) additonal screen, which, in turn, you’ve bought really cheap somewhere.
There are open questions as to how windows would be managed on this extra real estate; This method may not be as smooth as the multi-head systems when you have an internal video card. Worth a look, though.
Or, just buy one of these: Lenovo to release ThinkPad laptop with 2 LCD screens