The "places to stay" section on the NRG page has many good resources, though most cost something. If I pay to stay I really like the AAC campground (meet fellow climber, water, showers, communal firewood), but I usually just roll into the walmart lot after dark. I think the NRG national park just opened some free campsites. Might be worth looking up.
Actually, I’m staying here at the free campground by the dam right now and it’s open. It has pit toilets, flush toilets, a sink in the bathroom, and potable water. I’ve been here for a week and even over the nice sunny weekend there were still sites available. They’re a little muddy but they have campfire rings and picnic benches. Hope that helps!