The cost of professional SEO (search engine optimization) services can vary widely based on several factors, including the scope of the project, the complexity of the website, the competitive nature of the industry, the specific services offered, the reputation and experience of the agency, and the geographical location of the provider. Small businesses targeting local markets might pay as little as $500 to $2,500 per month. Mid-sized businesses targeting larger markets or competitive niches might pay $3,000 to $10,000 per month. Large enterprises or those in highly competitive markets can expect to pay upwards of $10,000 to $20,000 per month or more. It’s essential to remember that with SEO, as with many services, you often get what you pay for. While high prices don’t guarantee the best service, extremely low prices might indicate limited experience or corners being cut. Always thoroughly vet any SEO professional or agency before hiring them, and ensure their approach aligns with Google’s guidelines and best practices.