Where can you buy these?

[kien]

Originally Posted by whatcaneyedo

I don't think those are available anywhere. They're probably protected locally, or they're just too large/delicate for collection and shipping. Or perhaps they're accepted as being currently impossible to maintain in captivity due to feeding requirements. Who knows... I'd suggest learning how to culture your own phytoplankton first and mastering regular coral keeping before moving up to difficult Azooxanthellate species.

I would completely agree with this. Even the more common sponges that you do tend to find at your LFS from time to time are ridiculously difficult to keep long term. Blue sponges, orange sponge balls, etc, you see those all the time at LFS. Sadly they don't tend to last long in captivity.