Check the power supply on the laptop. As was said before, all of them will handle a wide range of power if you have the adapter to plug it in the wall. The IBM one I am looking at now will handle 100v-240v @ 50-60 hz.
As for what you are looking for, we found a power conditioner for around 70 dollars. It has a over power and brown out protection, just incase. It basically is a cube about 5x5x5 that has 4 outlets on it, and will cut power if it goes over or under a certain voltage, for countries you can't be sure of the power output. Not sure what its range was though.
http://www.altex.com/product_info.php?cPath=25_38_190&products_id=650
guess it is only good for 120, but if you use a converter for it first, then plug into it, you should be good. Not that big or heavy.