Getting an antigen test in Negril is almost as easy as finding ganja. 😁

There is a testing site at Coco La Palm, Boardwalk Shopping Village has a location at I-Doc & Dr. Grants office in the Sunshine Plaza (where Hi Lo is located).
There are mobile type units along the road...you'll see the signage.
You won't have any problem finding an antigen testing site.

I'll also add...Canadians etc that require the PCR test instead of the antigen test to return home...
in Negril you have the choice of going to the Boardwalk Shopping Village to I-Doc, Dr. Grants office at Sunshine Plaza and the Omega Clinic in the XYE resort...appts required.

Your hotels can set up your testing for you...albeit the cost will sometimes be higher for the convenience of coming to you.