FJD is sold by Travelex in Australia, not sure if they also buy. Any bank in NZ or Australia would be able to buy from you (for a better rate, generally). How many FJD do you have, there is technically a FJD 500 restriction on export amount from Fiji (not sure if that affects ability to sell it outside of Fiji, also whether the current sanctions against the Fijian gov't affect currency transactions of larger amounts).