hotels starts at 25Euro/night/person. this hotels are about 5 kilometers away from the ring! i always stay there,too. hotels which are very close to the ring start at 35 Euro/night/person. You don´t need to pre-book the rooms. there are hundreds around the ring.
opening times for the weekend from 9 september to 12 september:
09 sep:closed
10 sep: 5:15 to 7:30
11 sep: 8: 7:30
12sep: 1: 7:30

The opening times next week are better!