We know it sucks. We have a 1.35kg parcel and the best we've found are these prices. In fact they are not even real prices: we deducted 5€ from every shipping amount to make it 'look less painful'. We will cover this costs ourselves.. but we are more interested in the product growing now.
Taking 2 is a good choice, since the cost for shipping 1.35kg and 2.7kg is not proportional.