Hey rob, think you've answered your own question, yep the tropentarn stuff is rarer than rocking horse shit, so worth posting up, where or how much for I don't know, it's rarity means there not that many users out there, so I'd say hit up the various forums & (as much as I hate to say it), the Facebook groups too, cast your net wide enough your sure to get bites.
alternatively, list them singularly on eBay, the "sum of parts" value should be higher.
good luck