There are TONS of wood shavings and mulches out there, along with tons of mixes and other substrates, but true Aspen is only one... it either comes either like little needles, or in bigger chunks.
What is mostly used for rodents is Pine Shavings... Pine and Cedar are bad for your boa.

Aspen or Cypress Mulch is probably the best.

Aspen looks cleaner and may stay smelling nicer..
Cypress is darker, better for more humidity..

later -Joe
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Thanks and take care - Joe Rollo
'Tis not the stongest of the species that will eventually survive, nor the most intelligent, but the one most responsive to change' Charles Darwin

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