All of the accommodation in Yulara, including the camping ground and hostel, is owned by the Ayers Rock Resort. And unless the free camping at Curtin Springs station outweighs the risk of driving in the dark for sunrise/sunset at Uluru, there's no other option. Even though there are almost 5000 beds, it's wise to make a reservation, especially during school holidays. Bookings can be made through central reservations. Substantial discounts are usually offered if you book for two or three nights or more, and you can also save a reasonable amount through internet sites offering discount accommodation.