Even though it's a "rare" drop, it's not that difficult to get them to drop. Don't buy them.
No kidding. I actually have 20 of them right now. If you're in Chapter 12 or 13, equip a fully upgraded Catalog and start killing those Sacrifices, they drop them easily enough. Even if they don't, chances are they'll drop Perfumes, which sell for 12,500 gil.
There's no good or bad side. Just two sides holding different views