Alot of you already know about this, but a few of you might not, so here it goes.
There is a little cave in Storm Peaks
It's not big, but inside you can find Wailing Winds.
These have pretty high droprate on Crystalised Fires.
In one hour i got around 9 Eternal Fires(!) And some other vendortrash.
That hour I was pretty lucky, the next one only gave me 7 Eternals, and some vendortrash.
The respawn rate on these are really fast, so by the time you clear the cave, new ones are there.
If you (like me) are pretty fast at clearing, just take a few mins and do something, then back at it.
Happy farming!