The cost of an SEO agency typically depends on the size and scope of your project. Generally, you can expect to pay anywhere from $500-$5000 per month for a comprehensive SEO package. This includes keyword research, content optimization, link building, technical SEO, and more. The exact cost will depend on the complexity of your project and the services you require. It is important to note that SEO is an ongoing process and requires consistent effort to maintain and improve your website’s ranking in search engine results.