Well I just learned you can buy the seeds if you import them from Korea - Here's an Amazon listing: https://www.amazon.com/dp/B01FBN0YLU/_encoding=UTF8?coliid=I1PXK40E7ZBTL3&colid=BR2JV45BOWWW
But I dunno man. Considering these are the only ones I've ever found, I am skeptical of their benefit.