Read a rumor that Ogashawa reaps a lot profits by supplying H-Fuel to Luxury Liner Hawaii. I think it should show (not a big profit of course, since its very close but it would be nice for the new economy to reflect at RP and rumors) Appearantly the Liner consumed a lot of energy and fuel. The profit pays for Ogashawa's operations adn the rest of fuel is exported.
(Also, Shinkaku producing Fertilizers is win)
Oh yeah, another slight issue. This rumor that I found says that Lights Arms are exported from Liberty to Kusari. Though the only route from Detroit Munitions I was able to find was Light Arms to Fuchu Prison. Perhaps this trade could show by making Lights Arms profitable at Deshima Station?
Universal Shipping platform of Trenton supplies Bounty Hunters of Sheffield station with Lights Arms as I've mentioned in a Happy Bounty Hunters Quiz quite some time ago. There is already trade from Detroit, but not from Trenton. Perhaps Lights Arms could be there, too? (with only slightly higher price of course, so it would still make more profit taking Arms from Detroit)
Edit (didnt want to post in a row) Cardamine sells for nothing in Bretonia. Some pirate bases buy it in Independent Worlds and Newcastle but other than that its as cheap as Food or Water. At least trafalgar in New London should buy it (maybe not much but at least for RP purposes) since its a distribution point as it was in 4.84
Edit 2: I looted Outcast smuggler with Cardamine in New London and my BH viewed that as a big opportunity, but I couldnt sell it for more than 200 credits.