Depends whether the item's small enough to fit through a letterbox. If it is, and it's a domestic parcel, then I can print a postage label online and drop it in the postbox down the road. If it's too large to do that, but small enough to airmail, then I have to visit the post office, so there's no major difference between domestic and airmail. If it's too large for airmail, booking an international courier is rather more hassle than a domestic one.
