Well maybe i was wrong then because ive unlocked them all whitout really trying.
Waht im doing is buy all of the 5 items(rice,wheat,g&s,fruit,soybeans) in a trading post ecept where its the most expensive. as i stated earlier. and sell it in the town ( if Profitable). if not then wait till the next one.
i only do this when i have to go to a town for a story purpose or character recruitement. i dont take time just to trade. i just do it as i progress the game.
and they just popped up eventually. i am now Just before the beaver Lodge fire and ive unlocked Gold craftwork, Wine, Miso/Soy.
Let's Rock'n Roll! (Black Arachnia)
I don't Rock'n Roll, I Buuurn! (Inferno)