Bluffnix is a goblin who lives in Jeuno. You can find him in Muckvix's Junk Shop in Lower Jeuno. If you have Jeuno fame of at least 2, you can start the first quest to upgrade your inventory 5 more slots to a total of 35. After the sixth quest you will have doubled your inventory and reached 60 total slots.
Today I decided to index the server I play on - Midgardsormr and get the prices for all of the required items for all 6 quests. I made a spreadsheet and published it via Google documents. Check it out here. I have subtotals for each quest as well as the grand total of ~152,000 gil.
In my opinion - since I haven't played for a couple of years - this is amazingly cheap and I can't wait to finish off the remaining 3 quests that I have.
Note for part 6 of the quest:
To obtain the items yourself, you will need to have Chains of Promathia, although it is not required to obtain this quest; they can all be purchased in the Auction House as well.
- * The Balloon Cloth drops from the Fomor Ranger and Thief in Sacrarium and Phomiuna Aqueducts.
* The Shakudo Ingot drops the Fomor Ninja and Samurai in Sacrarium and Phomiuna Aqueducts.
* The High Quality Eft Skin drops from both types of Eft in Bibiki Bay; it is rather easy to obtain.
* The Iolite drops from the Corse and Arch Corse in Attohwa Chasm.