While it's away from the action, this traditional cypress home with cheap Japanese dorms and a common area with an irori (fireplace) make it a nice place to hang out. Take the Enoden bus from stop 1 at the east gate of Kamakura Station to Kajiwaraguchi (¥240); it's a one-minute walk from here.
There are bicycles for rent (¥800 per day) and a communal kitchen; zazen meditation tours to Engaku-ji are offered during the week.