The Humble Bundle has long been a way to not only support the developers and charities you love, but to also grab some quality games at a very affordable price. There has been some standout bundles in the past, and the current bundle is definitely one of the special ones. The Humble Deep Silver Bundle features a variety of games from the Deep Silver catalog, including a good amount of cooperative games in the list.
Humble Bundles are an awesome way for you to beef up your gaming library and support charity and developers. The majority of the games contained in the bundle (basically, everything but Risen 2: Dark Waters) feature cooperative play. For those of you who love Steam, the bundle contains codes for you to use on Steam. If you are against Steam and programs like it, the games contained are also DRM-free copies. It's literally a win-win situation, so don't delay.