If you're not after profit, there are several different routes to take through Gallia that net you a bit of cash. The route Alex Heartnet suggested is the best I've found so far... hopefully it will be better with the release of the Core Systems. You can't expect the Border Worlds to be full of opportunity.
Just a word of caution... if you're going to play a Gallic trader, make sure your ships has the proper IFF and ID. People are abusing the "Gallic trader" title like crazy, so the GRN and GRP are really being strict.
I have found a route that gives 12-13 mil per hour in a transport with 3000 cargo and it's Gallia-only. I don't do these routes because I have found some that are 18-19 mil outside of Gallia per hour with 3000 cargo.
well i've been talking with dusty about getting some profitable mining locals in gallia, but it probably wont happen until the gallic core worlds are opened up.
Then again, when the core worlds are open, we'll have probably 4-5 new systems (at least), so finding inter-gallia trade routes probably wont be as difficult.