Comment by themaninthedark

Reddit (https://www.reddit.com/r/elementcollection/comments/mf5v0u/i...) says that you were able to get some here: https://www.luciteria.com/elements-for-sale but I didn't see it listed.

edit: found it but discontinued... https://www.luciteria.com/element-cubes/plutonium-for-sale