Me too! Was planning to stay at Nava de la Asuncion tonight but was told yesterday that it was full. The other hostals & those in Coca were full too. I finally found a place to stay in Santa María for €40 in a lovely home. My budget for lodging has definitely burst.
Just finished the Madrid yesterday. Absolutely georgeous. Very few pilgrims, plenty of free beds in the albergues and hostals except Coca. But call ahead, and be flexible on the planning ahead.