Retailers are grappling with surges in online orders and consumers are starting to see more "out of stock" messages in the age of coronavirus, according to a new study by Adobe Analytics. The research firm analyzed data from trillions of visits to retail websites and from millions of product SKUs, finding that online grocery purchases are leading the eCommerce boom. Among the most popular items in people's internet shopping carts: Health products, gym equipment, toilet paper and canned foods.