To celebrate Q Games' 10th Anniversary, the team behind the PixelJunk series of games are hosting a monster sale on the PlayStation Network. You can snag PixelJunk Racers, PixelJunk Monsters, PixelJunk Shooter, and PixelJunk Eden for just $1 each. More recent titles like PixelJunk Shooter 2 and PixelJunk SideScroller are also half off.
Every game listed above features two player local co-op play - so it's the perfect excuse to stock up on couch co-op games to play with your friends, kids, or significant others.
There's an excellent post on the PlayStation Blog from Dylan Cuthbert, President of Q Games, about the company's history and how they came to develop so many PSN titles on the PlayStation 3. Great little tid-bits of info, like the fact they actually created the PS3's ribbon interface and several visualizers for the system. So check it out, stock up on the PixelJunk games and enjoy them with a buddy!