Tarps can be found relatively cheaply at the local big-box store in the room.
Also, a big part from the cost could be the number of mistakes help to make. There are various sites which sell these kind of materials at the lowest rate. Car wall chargers come many sizes, shapes and use. http://Www.Cunest.CO.Kr/bbs/board.php?bo_table=free&wr_id=278817