13 years later, this still works great! I needed components for the Olde Rarab Tail and the Login Rewards Moogle was unavailable due to the end of the month, so I went to farm them instead.
Followed the advice here and went to Dangruf Wadi, near the North Gusta exit and got a Stone after my first Natty Gibbon (Monkey) kill. I was able to collect multiple Seasoning Stones and Fossilized Fangs from the Natty Gibbons and the Trimmers (Crab) there.