Just a note; the scroll is RARE so you can't get more than one at a time. 100gil entrance fee to the port so i'd say the total cost of the scroll is 4,500 gil. Selling for about 10,000 on Shiva atm.
Port Al Zahbi, you have to pay the fee to see him. He's standing near the crates on the right side of the port. (facing from where you pay to get in at)