[qualiteam]

Hello David,

At the moment there is no such feature in X-Cart 5, but it can be implemented as a custom module.

As a quick hack you can add the following rules at Backend -> Look & Feel -> Custom CSS tab:

.product.out-of-stock .product-photo > a:before {
  content: 'Sold out';
  color: red;
  font-size: 20px;
  display: block;
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 1em;
  margin-top: -0.5em;
  text-align: center;
}

Not the best solution, but may work while you are creating a more solid custom module.