I am currently buying orchid bark substrate from local reptiles store, I believe they are selling zoo med repti bark ones. It cost around $3 for 0.4 kg for me. I think their prices are insanely expensive. So i searched around and found chinese's websites that sells 1 kg for like $1.8 dollar. Looks like a great deal to me. The thing is, do I need any extra precautions when buying their substrate? Is it safe for my tortoise? or is it not worth the risk? or it will just work fine like those that the reptile shop sells ones? Should I ask the chinese seller for more info?