早速配送していただきありがとうございます。
12個追加で注文したいのですが在庫はありますか?
在庫があればすぐにお支払いをしますので、請求書を送ってください。
宜しくお願い致します。
Thank you very much for the prompt shipment.
I would like to make an additional order of 12 units, but do you have inventories?
If you do have them in stock, I would make the payment immediately, so please send me the acquisition.
Thank you.