Kessar the Unknown
ShinRa Guard
the most expenisive ive found at the moment grading on accesabilty and easiest to steel with the most profit to be made is the "STURDY BONE from any high ranking skeleton. 1 bone earning you 640 gil, I spent 30 - 40 mins harvesting these bones, along with other smaller items that came my way and made a cool 40,000 gil which went in my pocket nicely