ClosetMaid 921100 Qubemates Cube Laminate Organizer with Shelf (Alder) for $18.69 shipped. Here is a screenshot for your reference. It is made of melamine resin, stackable, has an adjustable shelf, and measures 16.4″W x 16.4″D x 14.75″H. Most places have this cube organizer for over $30.
Originally posted earlier, this post has been revised and is just a friendly reminder.