If you're talking about the compressed blocks of coconut fiber, try Eco-Earth. I'm pretty sure theirs is sterilized before packaging.

You can also try Repti-bark, which is sterile and holds humidity well, which your scorpions need. (I'm assuming you have Emperors)

For a different insect, I have a mix of Repti-bark and sterile peat moss, which is a nice, soil-like substrate.