Q. Can I change it to another product when the product is sold out?

A. You can change the only same product, impossible the another product.

Q.When the Q product is out of stock, if the product is out of stock, it falls short of the free delivery policy standard, what should I do with the shipping cost?

A.If the amount of free shipping fee is not satisfied due to the occurrence of sold-out products among the ordered products, should subtract the shipping fee in the product price and then process the refund.