Boxes for the Xbox 360 and PS3 versions of the Ghostbusters game at Walmart.com have a special call-out, saying buyers get an in-game downloadable proton pack, exclusive to the massive chain. If the picture accompanying the item is any indication, the exclusive pack is slightly bronzed – which is to say, all it means is that everyone you play multiplayer with will know you shop at Wal-Mart. Still, perhaps it’s your thing. Do whatcha wanna do.