I am considering changing the hard scape of my RCS aquarium, by adding Manzanita wood. I have only recently even heard of it, but it looks like exactly what I have been looking for.

Now, where can I buy some? I would prefer to buy it in a shop as opposed to online. Will it already be set to go in the aquarium, or do I have to coat it with something to prevent rotting? If so, what do I coat it with?