Wave/Fire Lunarite is still expensive and hard to get, the event didn't seem to help much. So I have a suggestion on how to acquire it.
Lunarite Cauldron: Same size as a Regrade Brazier and Archeum Tree Sapling. Obtained the same way as those two. (Prince/Queen Purse/Crate). Same growth time. The sprite can be the Daru Cauldron sprite.
To be activated, it needs to be first filled with Auroria Mineral Water, then lit by a Smoldering Log.
It can grow into 3 types (dust lunarite, superior lunarite, or fine lunarite, the chance of each should be the same as dust/shard/crystal from the Archeum Tree)
Then, like with the tree and brazier, you can either identify the Lunarite (random chance between Fire/Wave) or break the cauldron down for a crafting drop (I suggest 5~10 Mysterious Garden Powder).