On these websites you can buy or sell complete web shops and businesses.
Sedo.com is the largest domain name marketplace in the world.
Dan.com is a domain parking service / domain marketplace.
Empireflippers is an international "broker" in online businesses.
Flippa is a large international platform where you can sell e-commerce companies, web shops, URLs and other digital companies.
Quietlight is a "broker" that mediates in the purchase or sale of (international) e-commerce companies.
FE international is a specialized company engaged in mergers, buying and selling of e-commerce companies.