Is it possible to get quality fish oil on line?

I buy carlson's fish oil on a regular basis in local health store, the super omega from carlson is always around $25, but on the vitaminshoppe website the same item is only half price:





http://www.vitaminshoppe.com/store/en/browse/sku_detail.jsp?id=CL-7142





I checked some of the items' label content and compare it with the original ones' sold by local health stores, but found there's slight difference between them. How could it be? Vitaminshoppe also has many local stores throught america, could it sell some fake items on line like those half price carlson's fish oil?Is it possible to get quality fish oil on line?
HAHAHAHAHAH

facial oil