I created a small Excel spreadsheet which allows to manually insert stations and their goods prices for import / export.
A comparison column has two dynamical drop down lists, where one can select the station he is starting and the destination station (new stations are automatically added to the lists).
The comparison column than automatically calculates the export prices from the first station against the import prices of the second and will display how much benefit every trading good makes.
The most valuable good is highlighted so one can see in two clicks which trading good makes the most profit to fill empty cargo.
It comes already with some collected data in SOL and data from 10 systems located around SOL.
Limitation: As I am using the German client, the trading good names are labelen with their German names, feel free to translate it.
Comment: The author also created an English version of the excel spreadsheet.