Hi, wanting to sell small jewellery items eg stud earrings and want to offer either free postage or minimal cost. I dont want to increase the "buy it now price" by costing  the postage price  into the asking price. Going by Australia Posts price guidlines it will cost a mnimum of approx $6.50, does anyone use envelopes or their own packaging of a particular envelope sized dimension and only pay for "envelope posatge" eg $1.20 for standard envelope up to 20mm  thick?