Pro: NFL preseason games sell out in Mexico and Japan, and last year a regular season game in London was the hottest ticket in town.

Six months ago it was the must-have gadget which some stores sold out of and many had to wait days or weeks to buy.

Meanwhile, thrift stores and websites are out of stock of vintage designs, the more elaborate the better.

The reason is that the product you need has been out of stock.

As a more practical example, the below snippet demonstrates how we could output a "(Out of Stock!)" message next to our product name if the product is out of stock