Another tip,

If buying in Negril, buy in multiples of 3 bokkles in the places like Hi-Lo, Quality Traders, or Chineymon (and probably other places that I don't frequent as well). You get a slight discount (called the wholesale discount) when you buy in 3s. In my experience this makes the price in Negril almost as low as the price at the Duty Free at the airport and you can pack the bokkles into your checked baggage and not have to mess with transferring, etc. I buy nearly everything in 3s in Negril, Ting, Spices, etc.