Up on this week's Xbox Live Deal of the Week, Major Nelson has informed us that one of the greatest co-op Tower Defense games is marked down. South Park: Let's Go Tower Defense Play has hit the 50% off mark for this week, sitting pretty at $5 (400).
Don't be fooled by this awesomely low price - we really, really liked the co-op, and the unique gameplay for a tower defense game didn't hurt either. Play as 4 of the South Park boys against waves of ginger kids, underpants gnomes, etc. by building various types of towers, as well as active player assaults (snowball throwing) to save the town of South Park.