This is an oil city and prices soar on weekdays, plus it's not uncommon for every bed in town to be occupied. That said, prices drop and availability returns on weekends and during high summer. Do, however, be sure to avoid the end of August in even-numbered years, when the Offshore Northern Seas Foundation (ONS) show entirely takes over town.
Try removing some filters. Alternatively, there are some nearby lodgings with availability below.