This item is also sold by two merchants in Tavnazian Safehold. Misseulieu Middle Level (I-9) and Migran, right next to him. The price I saw for them from these merchants was OVER 7 million gil. This may be because I'm only on Chapter 4 at this time, or because I've only done a handful of quests, but either way, that's a lot for a merchant! They both sold two other pieces of this set - Feet and Legs. The Feet were priced for over 25 million, and the legs for about 4 million.
Does SE expect people to just casually have this kind of gil to spend on an NPC merchant?