Wings to Discovery

[Raytien]

Help a brother out, currently taking a break away from FFXI to complete a perfect file for FFX, and i have run into a crunch trying to obtain 'Wings to Discover', the item used to customize an armor with the Break HP limit ability. I have only found 3 mobs that have it 2 of which require an absured amount of gil to be bribed with for the result of only four or eight of the item recieved. and the 3rd mob that has it is Shinryu in the monster arena which awards 2 for every win against him costing 15,000g a pop to fight.
There has to be a more cost effective and less time consuming way to get these. Keeping in mind that i am trying to construct godly armor for the entire crew not just one or 2 people.