This week, several Xbox Live Arcade titles are on sale for Gold members. (CHEESY ONE-LINER ABOUT METALLIC PHALLUS) Of the six games on sale, two of them feature co-op! The most recent of the two is Serious Sam HD: The First Encounter. (CHEESY ONE-LINER ABOUT WHAT "HD" STANDS FOR) You can grab Sam, with 4 player online co-op, for 800 points, which is 33% off. If that's too rich for your budget, perhaps the second co-op game on sale is for you. Duke Nukem 3D is available for 400 points, which is half off! (CHEESY ONE-LINER ABOUT STRIPPER ATTIRE) Better grab these deals while you have the chance!