Where can buy Cheap and authentic UGG boots?

Actually, these boots aren't from the Ugg brand, but they're just like Uggs. They are made from the same material, and they look the same, just without the Ugg Australia brand in the back. These boots are made from authentic Australian sheepskin, and they are the same size as the Tall Uggs. These boots come in brown, chestnut, black, and gray. You can get these boots at a Costco store, and they contest $35.