Where is a good place to buy driftwood/other accessories?

Where is the best place to buy quality driftwood for a tank? I am having difficulty finding a source of high grade driftwood that would work well in my tank. Perhaps I am being picky, but any advice would help!

Can I use "found" driftwood? I live near an ocean and sometimes really great pieces wash up. Is there a specific process to getting them ready for a tank, or is it too complicated of a process?

thank you for your help & advice!