BBrasta,

They are advertised on the Duty Free Web site for Sangster, see link below.
They might want to consider placing an order online to be picked up on arrival.
I have never done this, so can't offer an opinion.
Duty free is right after you exit the immigration hall and before customs.

https://jamaica.shopdutyfree.com/en/...hol-ks-600-pcs

US prices

1 Carton $47
2 Cartons $85
3 Cartons $113

Enjoy