Does anyone know how to get Maptio in the USA/Canada?

I want to use the same medium this guy uses:
http://www.youtube.com/watch?v=3Sa1IIgmtqY

Mapito is a combination of rockwool and poly urethane foam scraps. I cant seem to find any places in USA/Canada that sell it. Maybe mini grow cubes are just as effective?

please advise
T

Bug buds..Thanks for the link +rep