Some pet stores sell it, but if you live by a river, you might be able to find some for free. I went walking by the river (the mighty Mississippi!) the other day and found two very awesome pieces for my next tank. Very nicely smoothed and polished. If you live by a river, you might try the same. I boil my driftwood for a an hour or so, doing a few water changes. This helps to remove the germs, bacteria, etc, and also helps to remove some of the color that would eventually end up in your tank water. Too much info?? Oh well, I tend to ramble!