The best way to get Pristine Hide is to farm Savage Leather then convert them into Heavy Savage Leather. For every 10 Heavy Savage Leather, you can buy 1 Pristine hide in Twilight Highlands at the leather worker vendor. For every stack(20) of Savage Leather, you can make 4 Heavy Savage Leather. You can easly farm a stack of savage leather in 2mins. So in about 5mins, you can get yourself a Pristine Hide. It beats trying to find an area to farm a Pristin Hide when you can buy them in no time.