[Spoiler] Wizards special substances as (seldom but) general goods

I would like to see Ectoplasm and Prismatic Jelly as (maybe very rare but) general goods. Also it would be cool to have a story line esp. for Ectoplasm: the Wizard tells you something about "lost souls" (or alike, I cant remember exactly). So what's that about?
For the special orders it could be changed to get these substances only with the galaxy sword, so one can't get it in the beginning.