These can be found all over but especially near the Tacky Wood Dolls, northwest of the Saunil District Node Manager.

This is a good steer ... there are two Supervisors with the two groups training on the Tacky Wood Dolls ... so plenty of mobs to kill... with good loot ... Supervisors seem to take forever to regenerate, so leave a mark on the map and you always know wher to find two :-)