How to supply 3 stations in 1 sector with 1 type of good, without NPC traders?

[Gorbald]

Hi,

I have 3 stations in my sector that need gold. I can't build a gold mine in that sector (no rock), so cargo shuttles are a no-go.

I don't want to use NPC traders to get gold (I want to set high buy/sell price).

 

When I order a ship to buy gold in another sector and sell it in my sector, it only sells to one station. When that station is full, it does not sell to another, but just waits until that station consumes 20 gold or so, and proceeds to dock to the same station again.

 

What should I do?

 

TIA