I have Limsa as my free port from having an authenticator, Rhalgr's Reach for my "Return" spell location (also free), Foundation, Gridania, and Uldah as my favorites (all max 499 before discounts), and I also have my apartment in Shirogane (max 249 before discounts) for a cheap port to Kugane/Othard. I also do the weekly squadron mission that gives 10 tickets that cut the costs on teleports by 40% for 2 hours each.