Almost anything can be sold on an ecommerce site. Of course, anything you sell should be legal, but other than legality, the only limit is your creativity and your ability to deal with logistical challenges. For example, selling particularly large or heavy items could lead to shipping difficulties, but there are usually ways to get around these hurdles. You can even sell services on an ecommerce site. In this case, the transaction will be handled through the site, but the service will be delivered in the “real world.” Basically, if you have anything to sell to customers, an ecommerce site can help you do it.