Best Buy Marketplace more than doubles the electronics retailer's online inventory, with new categories including musical instruments, kitchenware and seasonal décor.

Customers who go to Best Buy's website will be able to find products that weren't available before, as it allows items to be sold by third-party sellers, such as seasonal items, small kitchen appliances, cookware, furniture, and tech-related accessories like custom video game controllers.

Best Buy is just the latest company to adopt the marketplace-as-a-service strategy. Amazon has a third-party marketplace, as does Walmart, Lowe’s, Nordstrom, Kohl’s, Macy’s, and Target. (Just to name a few.)