isolator hash is made with the dutch version of 'bubble bags'... generally it's made with dutch pot (trimmings) which means that it usually ends up being far more potent than imported hash. but of course, potency isn't everything. and nothing is nicer than a fine handmade hash from Jamaica,Turko or Morocco or Lebanon or India...
but of course foreign hash has such a range of quality, it's hard to know what you're getting until you smoke it. usually isolator hash, when bought from reliable sources, will be priced according to it's quality. only the most intense bubble hash will sell for around 50/60 $US a gram in my area ... usually it's about 15-35