I've actually found the scorpions that that pop near the first door in Rangumont Pass commonly drop claws, as well as the ones in Maze of Shakrami. That altepa ones have a pretty terrible droprate, probably because there are so many spread out in that zone.
Girtabs seem a bit higher-tier than the ones I mentioned, but you could get some friends to help farm them, just call it a skill-up PT
