Don't forget all the Mumakil and such. We know elves sometimes used ivory, I imagine Gondorians would too. Plus since we are talking of jungles, some of those woods would probably be rich hardwoods; fine materials for the construction of ariticles and ornaments for the houses of the rich and noble (they have lebethron on thier home turf, which is sort of like ebony, but there are undoubtedly other rare and costly woods in ME). The Gondorians were already haughty by this period; a love of fine things would no doubt come with it.
Probably there would be a deep demand for spices and incenses as well. Considering themselves the inheritors of "True" Numenorian culture, I imagine the Gondorians would be big into fragrances, so they could pretend they were still living there and smelling fragrant breezes from Nisimaldar. So anything that smelled nice would probably be valuable there bigtime.
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