Authentic jerk calls for green pimento wood. You won't find that in the U.S unless, as Tom mentioned, you grow your own bush.
For dried wood, this is the only source that I'm aware of. Pricey, but available.
For something of a workaround, soak 2 TBS allspice berries in water for an hour or so. Put the berries in a foil pouch and punch several pinholes in it. Put the pouch in the wood box with a small piece of apple or pecan.
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