Camp Eagle has hundreds of beds onsite. Some are within a few seconds, some within a few minutes walk to the start / finish line, main race area, and dining hall.
You can choose from really nice hotel style rooms, dorm style rooms, hostel style rooms (where you just buy a single bed in a room of 12-24 beds), yurts, screened shelters, tent camping, and car camping.
The following price list may change (you'll have to check with Camp Eagle to be sure. But this will give you an idea):
Camping: $10 per tent
Hostel Beds: $15
Screen Shelter Cabins: $35 (3-5 beds per cabin)
Dorm Rooms: $120 - $160 (At least 12 beds per dorm room)
Basic Parking side Hotel Style Rooms: $90
Basic River side Hotel Style Rooms: $100
Yurts along the river: $120 (14 per bldg)
Hotel Style Suites: $175
You can also sleep at one of a couple hunting lodges / inns in the little town of Rocksprings. Although there's not much to do there, there is a gas station and grocery store.
Also Kerrville is a full on small city, with several major hotel chains, many restaurants, gas stations, etc.