Where is the cheapest/most reliable place to buy aquarium driftwood? I saw a nice piece of hard wood at Petco. It's called Zoo Med Aquatic Natural Mopani Wood. It's two-toned and very nice. However, it's only 12 inches long, and I'd like something much, much bigger as a centerpiece for my 30 gallon tank. Also this Mopani wood doesn't rot, so I'd prefer a type of hardwood like that.