Can you use it? well I dont know check the backside of the monitor to see if there is a port for a DVI cable.
Cost, not much, but they are expensive cables though. At newegg:http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&DEPA=0&Order=BESTMATCH&Description=dvi+cable
You should be able to go to any local store though and pick one up, im sure they have them.
of cource you can download the new calalyist drivers, its generally reccomended to keep drivers up to date anyways, although do not count on much of a performance boost, mostly bug fixing and small tune-ups