[Suicide Junkie]

The only problem at the moment is the fact that price is built into the component itself, and shops only have one overall multiplier for buy/sell price.

What you could do, is use jobs.
Visit a variation on the commerce guild, and it would have jobs to deliver goods to the local system.
The key is that they don't give you the goods. You have to buy those goods elsewhere at regular prices. (All the local stores could be set to not sell the required objects)