As I said, we have it growing naturally here. We just cut that big branch off a half dead bush in my parents yard. I know both (smaller) pet stores in town carry nearly as big pieces that have commercial tags on them and you can tell they've been commercially sanded/sterilized. Some company must sell them, I just don't know the name. There are also other types of parrot safe woods that grow naturally in other regions of the country, but you would have to research what they are. Sterilizing natural wood is pretty easy. You just get your piece, power hose it down, scrub off the dirt, hose it some more and right before you set it out to dry, pour a couple pots (depending on the size) of boiling water over it. I've never had an issue with bugs/illness due to using natural wood literally right out of the woods. My parents have been providing their 3 birds with natural manzanita from their yard for 40 years, and none of them have had issues with it either. If you do use natural wood, you'll also need to be sure to sand it down where needed and use a drill to make holes, then wire it into the cage (or use basic hardware like l-brackets and crews for a freestanding perch).