All the products were in stock when your order was confirmed, but after your payment was confirmed, one of the products in your order went out of stock. In this case we will contact you and we may ship all the in-stock products that you have ordered first and for products which are out of stock, we will ship it to you immediately once the next shipment of stock arrives or we will refund to you for those items out of stock.
The product was already out of stock when you made the order. In this case we will ship all products in the order only when the new stock for the out of stock product arrives. However, if customer is willing to pay for the extra delivery fee to get the available items first we can ship the products that are available first. And once the out of stock arrive we will ship it out and notify customer.