[cypher]

I think Aubiose can be a bit sharp & or dusty, I use a combination of hemp & fitch with mine although I have used hemp on it's own too.
I've found the hugro hemp to be the softest, not the cheapest but a bag still goes a long way.
Fitch is recycled paper which comes in rather large bags but if you have the space to store it then it's really economical & is a lovely substrate too, barely any dust & nice & soft for the hams.