if you have some games for other systems lying around and you don't play them/can;t sell them, take them to a store that accpets trade ins (blockbuster, EB, Gamestop) and get some credit. Stores like EB and Gamestop do deals where if you trade a certain amoutn of games you get a console for 199, or free depending on the prmotion they have going. Check them out.
also look for open box items at store like Best buy. The usually take off another 20 or so bucks.