There is a temple at the top of the zone Sparkfly Den, that has several layers and each layer has packs of 3-4 pirates that can easily be rounded up and AoE'd down.
They drop some gray items and dust that sells for 30c a piece on the TP, and its almost a 100% drop rate.
Here is the location:
Don't forget to use your food and boosters for maximum awesomeness