there's a set up charge for sea shipping, no matter how less the goods are, some charge are the same, such as B/L charge, handle charge etc. besides the shipping cost you paid to us, when you collect goods from seaport, you have to pay again your local charge. some customers thought sea shipping is always cheaper than air shipping, but if your goods are not much, like 20kg, 30kg, the sea shipping is much expensive than by air.