Alsey Refractories, in St. Louis, MO has a 2700F castable refractory.
They have distributors in North Dakota. Both the Grand Forks and Fargo Hebron Brick Company(http://www.mybrickstore.com/) stock it, I am not sure if their other locations do as well. It is around 33$ per bag for a 55lb bag(not sure on cubic footage). I will try to get an impression on what it is like and put something more about it up here once I get started on my next furnace.