Flippa is a popular marketplace for buying and selling websites. You can find various affiliate sites listed there. Empire Flippers offers vetted websites with proven income. You can browse different niches and choose what fits your goals. WebsiteBroker also provides options for purchasing established sites. You should check the site's traffic and earnings before buying. Another option is to explore social media groups focused on website sales. You can connect with sellers directly in these communities. Research thoroughly to ensure you make a wise investment in an affiliate website.