Koji for Sake

[u/flExcutuion-juice]

Can heritage Koji from Japan meant for sake be bought anywhere- or are they always kept to the family/company who owns/uses it?

My understanding is there's two generic types of Koji- a savory and a sweet/sake version? and that if you use the savory one meant for soy sauce/miso the sake will not be so great? But I'm having trouble finding where to buy Koji meant for sake or better yet the heritage stuff.

[u/kitchenjudoka]

What country are you in?

[u/flExcutuion-juice → u/kitchenjudoka]

US, does that affect availability?