You got Hunts, you got 80 Dungeons, you got Spiritbond for free Materia. Do your roulettes everyday and you easily got enough cash to fill everything in the armour. Roulettes pays roughly 80-100k gil a day and go Tank/Healer if you want it guaranteed.

There's 0 excuse to not have Tier 8 Materias these days, SE has made it so much easier to obtain the highest tier in this Xpac compared to 2.0/3.0 days. 80 hunts PS4 players can easily make it by being in the party, all you got to do is Strike once with an AOE regardless if you can see it or not you will still hit it.