There are taxis at the airport but it will be very expensive to get one to Oracabessa. Your best bet is to get the Knutford Express Bus from Kingston to Annotto Bay via Ocho Rios. https://www.knutsfordexpress.com/ It will run you about $25-30US per person. Once in Ocho Rios you can get a taxi or rent a car. Try https://www.islandcarrentals.com/ for a car rental.
They have Cambios all over the place. You will get a good price at the https://fxtrader.gkmsonline.com/ as well.
Hope this helps.