Wow. for one stop prices you could buy 3 phones with minutes. Like N8 said, There are Digicel and Lime outlets in most towns and you should be able to buy one with lots of local and intl. minutes for under 30$US. Or check out the drivers on Negril.com and get some prices and call from the hotel. They could take you to a store on the way to your excursion.you could keep it and take it with you or give it to your favourite Jamaican on leaving.