Guild Wars 2

I know that with the Queen’s Pavillion update the price went down dramatically, but the price after the Pavillion being temporarily removed is still going down =O

Is there another place to farm them? Or might it be that a lot of people stacked on them and are still selling them?

Champion Bags/Boxes also drop cores out of them. This means the price should remain stable where it is for a while. I farmed the Frostgroge train for about an hour this past weekend, and this is what I ended up with for core and lodestones.

4 -Charged Cores
2 – Destoryer Cores
1 – Destoryer Lodestone
4 – Glacial Cores

The chests you get in the invasions can also drop cores and lodestones. I even got a core from one of the later personal story missions.