The cost of an SEO backlink can vary widely depending on various factors such as the quality of the website linking to you, the authority of the website, the relevance of the linking page to your website, and the competition in your niche. Some backlinks may be free, while others may cost hundreds or even thousands of dollars. It’s important to note that buying backlinks for the purpose of manipulating search engine rankings is considered a violation of search engine guidelines and can result in penalties. Therefore, it’s recommended to focus on building high-quality, natural backlinks through content creation, networking, and other legitimate means.