I am still trying to locate this place. Could be a small shop in one of the All Inclusives? No one here seems to know.
That being said psilocybin is available at many places in Negril. From micro dosed measured doses to "take your chances and maybe see God" strength tea.
I have always been partial to Window Pane, I was micro dosing over 30 years ago.
But I have not been able to locate the shop yet.
If you know where it is, give us a clue.