For me and getting this was easy,i had a many spots but the most unfarmed unused places would be in Hillsbrad. There are two place roughly in same area. The one i used which was the yeti cave is a 50-50 chance no one is useing.. If no one is in it you can make circle around there starting from outfront to both end points then repeat. It is filled with yeti's that drop med/heavy leather and they are level 30-32. This place is located just north of Southshore.. Now another place i had good luck with was just a bit more north where the yeti cave is.. No one was ever there for me, I was farming the cats roughly around 30-33. Both near a town for horde and alliance so i saw nothing wrong with it.
<--- Brinek Horde Tauren Druid 70, Guild:[Sin] Server:[Icecrown]
I will be helping with other peices of leather as i move onn