answer:The PO wants to know the outer dimensions of the box (which is going to be larger than the dimensions of the laptop, because presumably you are going to pack it in something so it won’t get damaged) They want to know the origin zipcode and the destination zipcode. If you don’t have one yet (if the item is still for sale) then pick a zipcode on the other side of the country, and say “Postage not to exceed $xx.xx) They also want to know weight. Heavy stuff costs more. Finally, they want to know whether to deliver it overnight (which will cost a bundle), or 3–4 day delivery, or parcel post, which can be 10 days. Cost changes depending on speed. Usually on Ebay I let my buyer decide how fast he wants the item delivered, and let him pay the extra for fast service.