Ok first you need to be able to have access to The Black Morass.
Just go in there kill the non-elite mobs.
Each mob can drop up to 3 Knothide leather.
Very easy to kill they have about 10K health.
You can get lots of leather with in an hour.
If you run out of mobs go out reset the instance and do it agian.
Sells for 15g-20g a stack.
And another way. (Not sure if this one was said)
Go to Shadowmoon Valley
Then go to Coilskar Cistern (52,25)
Kill the Cobras in there.
They drop Cobra Scales (5% drop rate)
With in an hour you should be able to get about 5 of them.
Sells for 30g each.
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