It'd be nice if Myconids sold magical potion bottle bundles and potion elixirs (the ones to measure how'd cost each potion brewing procedure).
I believe there is a merchant in Mycopolis that sells potion bottle bundles. Not sure about the elixirs, but I think they were there as well last I checked.
Nope, no bundles by Mycopolis that I know of. :)
They do sell single bottles, though, at a decently cheap price!