According to Information Resources Inc. (IRI), out-of-stock products cost U.S. retailers approximately $47.4 billion each year.

As eCommerce grows and consumers become more accustomed to at-home delivery of all types of products, subscriptions services are evolving and offering a variety of specialty products and services, further driving the appeal to consumers.

This month, the Moustache Coffee Club, Los Angeles, debuted an artificial intelligence (AI) program that recommends specific coffees to its members based on their taste preferences. The AI evaluates coffee based on attributes including flavor notes, production methods and area of origin before selecting and shipping subscribers a coffee that best fits each subscriber's individual preferences, the company says.