Herbalists can make them.
So "I" dont give any, PCs either make or loot them.
If you consider the OP to mean how many I put in treasure, I voted Rare, but often its Very Rare.
I looked at the picture of "Everything" by voidtools.
Their example is searching for *.exe in a folder.
Windows does that? Is that their best example of capabilities?
I had no idea. This is truly horrifying and disappointing.
When Peterson came out with the books, I was like "Heck Yah I'll support this" and thought it was going to be a fresh new long lsting start to a product line.
I'm bummed out now.