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