I did get them online. here’s the link. a really good deal. less than $5, Free shipping, and it was buy 1 get 3 free. i somehow got 5 in my package tho. :D I’m pretty sure they’re real. They float to the top for photosynthesis and all. 

They are kinda tiny though, not even half an inch. If you’re looking for larger one, you may want to look around. Ebay i think has the best deals from the websites I’ve been to. Not sure about whether they’re ALL genuine and healthy because of the different sellers, but if i were to but some more, i’d go there first.

Also, i’m no pro at Marimo hunting, so do research!