What bag should I get for a Pentax k200d and a 18-55/50-200mm lens?

Just a simple cheap bag, with room for a camera one attached lens and another lens. It needs to have some extra pockets for the rest of my equipment(cords, batteries, etc). Under $50, and offering good protection(I'm not asking for anything that is indestructible, but it needs to keep the came safe from me, and my friends).