I think......

I will set up one of my retainers in Limsa Lominsa... It will specialize in selling items that are gathered locally. It also can sell items that are of low (or middle) level, since I THINK there is a tax reduction for those items?

Since I am not in a hurry, it can take time, and contribute to building up a market community in Limsa Lominsa.

(Why Limsa Lominsa? Because that is my home city (it reminds me of San D'oria) and where I spend a lot of my time besides Ul'Dah).