PHOENIX ADVENTURES TOUR is perfect for those with kids. They have special deals for kids aged six onwards, and even birthday package specials. Their website offers a convenient online booking system. Perhaps the most interesting thing about them is their ability to set up in an open space.
While they would prefer for you to visit their permanent location, they offer an Anytime, Anywhere, Paintball service, whereby they come to where you want and set up an arena (as long as there is running water, an open field, and access to electricity). This service is hands down the most convenient for private events.
Price: For prices, check out their website for birthday deals, corporate packages, group deals, and other custom prices here.