Dell is the only major computer manufacturer to trade almost exclusively online. Starting as a traditional mail order business, it began selling through its website in 1996. Dell’s model revolves around building machines to order. This is a more involved process than selling lots of the exact same thing in bulk, but in order to ensure deliveries aren’t slowed down excessively, Dell offers a range of around 150 “Ship Fast” computer configurations. These are ready to go, meaning each can be delivered to your door in two to three days. Dell’s last financial results showed income of $2.6 billion.