Grenada is your Spice Island. If your itinerary includes this port, this is the place to stock up on various whole spices. Although I found Vanilla to be expensive there.
There will be vendors on Grand Anse beach $2 water taxi, and many at the port. Bargain for your best deals. I even have shell adorned necklaces with nutmeg and spices on it that make great souvenirs (2 for $5). I had one hanging in the kitchen for that Potpouri type aroma.