I was looking for source of turface in Seattle area and found two places: Ewing Irrigation and John Deere Landscape.
John Deere Landscape has some with name "All sports", but i am not sure if it's what needed from Tapla's mix. I am trying to make a mix for my succulents.
Ewing Irrigation has more then one kind. Again I am not sure what should be a criteria to pick one that needed.