Reptile bark is not as good as Aspen IMO, the pee will go right to the bottom and nothing gets absorbed by it.
I use Aspen for both of my current snakes and the mice I breed, a big bag (114 liters) only costs about $16. With weekly replacement for the mice and monthly replacement for the snakes (+ spot cleaning replacement), it lasts about 2-3 months. No issues for mice or snakes so far :gj: