If ships are out altogether - then you might want to keep trade goods in with as i mentioned before with higher value - this will actually make for a decent constant income (as in the landlocked regions).
You could also add prerequisite buildings in order to exploit trade goods - say a lumberyard (for wood) or a textile guild (for silk) etc before a trading post can be set up. Then it would take some investing to reap the benefit.
!it burnsus!
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