I am not in the coffee business so I can't really answer your questions. I do know that coffee drinking is not that popular in Jamaica. Most of the coffee grown in Jamaica is exported. Your best bet is probably to contact people who are in the coffee business directly. They should at least be able to point you in the right direction.

I think the following links may be helpful:

Jamaican Coffee - a beverage of distinction
Coffee Industries Limited ® The Coffee Mill of Jamaica ® 100% Jamaican Coffee
Jamaica Trade and Invest