Inside the national park, 18km southwest of the park entry's information centre, Moilt Camp is run by Hustai National Park Trust. It comprises basic wooden cabins, plus two gers, all clustered in a pretty valley. Prices are similar to Hustain Tourist Camp, although facilities aren't as good. The location, though, is far nicer.
If you don't have a car, you can hike here from the visitors centre in about five hours.