They are not that hard to produce.

in Germany i find mystic potion / purple passion for 3000 euro now, but i know that breeder also has quite a collection of BEL stuff, including super phantoms and super mojaves and super mystics.

mystic potion / purple passion is a trendy morph, everyone wants one, but i doubt it will take long for breeders to supply it accordingly. quite a few breeders have what it takes to produce clutches of potions by breeding super mojo to super mystic. I think it will come down to a price that is comparable to all the other supers and 2-gene combos in the BEL complex, and that might happen quite fast.