My authenticator free teleport is Limsa which early on was a great choice since it has easy access to the waking sands via the boat and essentially cuts costs when getting from Stormblood zones back to ARR zones. Even now its a good choice since its my chosen Grand Company and has easy access to vendors and the market board.

My Return is set to Rhalgr's. I go there often enough that having it also be free is a great choice and gives me access to the Gyr Abania region cheap.

I have an apartment in Shirogane which cuts my costs for going to the Doma regions tremendously.

My favored destinations are New Gridania, Ul'dah and Foundation to get around the world cheap.

On top of all that I have a metric ton of the 40% cost reduction tickets from squadron missions.