The i70 gear is found in some of the 50 dungeons, the i90 can be exchanged by some dungeondrops. i100 can be bought with allied seals and the upgrade items for this with poetics. i170 and i200 can be bought with centurio seals, also the upgrade for item 170 to 180. upgrade items 200 to 210 can be exchanged by the mhachi drop from VA.