i collect my own, and sometimes buy it if it's an attractive piece that would suit my setup. i have no idea what type of tree the wood i use comes from, but it's pretty stable in the aquarium after the initial tannin release (3-4 months or so, then it seems to leach less and less every day). I actually have lots of spare wood that I'm looking to unload (see swap and shop), as there is abundant wood in a local lake. I plan on checking streams in local hardwood(oak, mostly) forests soon to see if I can find any other types of wood(read up on the ivory-billed woodpecker... i'm about 20 minutes from those woods, lots of swamps, lakes, streams, and hardwood trees; as you can imagine, soaked wood abounds).
I always recommend whatever will look best and be safest in your tank. if you have access to clean streams/lakes/rivers and have a way to properly clean the wood, and you spot a piece you like, then why buy it? however, if you can't find it, don't trust the water source where you found the wood, or just don't have a pot big enough for boiling it, then storebought is your best option. Also, you will often find that pieces in the stores are just far more attractive than you see anywhere in nature.
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