Advice needed on aspen alternatives

[Ronin]

Great alternatives I can think of for your boa are Cypress bark, Aspen (which you can no longer use), coconut bark, newspaper, reptile carpet, and ReptiBark. I prefer Cypress for looks and keeping up humidity but if you have many snakes newspaper is cheap and easy to clean up. I wouldn't use sand, its not a sandy animal and eating it is still not good for any reptile.