including postage
Used in commercial contexts to indicate that the price includes shipping costs.
この商品は送料共で5000円です。
This item is 5000 yen including postage.
送料込み is a more common and casual way to say 'including shipping'. 送料共 is a formal commercial term often seen in price listings.
Compound of 送料 (postage) and 共 (together, including).