Mandrake root etc. are very cheap. I can't put an exact figure on them (haven't played in a while) but 1 thousand should cover the cost for a few of them. This is also the case with Merman Meat etc.
Once you've sorted out your internet connection you'll need to set up your own shop (done when playing the story mode - from one of the shop options from the guy in the village). Finding other traders can take a while but it's usually worth the wait.
Once you've sorted out your internet connection you'll need to set up your own shop (done when playing the story mode - from one of the shop options from the guy in the village). Finding other traders can take a while but it's usually worth the wait.