The amount that a small business should budget for monthly SEO services in the tri-state area will depend on several factors, including the scope of services needed, the level of competition in the industry, and the business's goals and budget. In general, small businesses can expect to pay anywhere from $500 to $5,000 per month for professional SEO services in the tri-state area. It's important to work with an SEO company that can provide a customized pricing plan that meets your business's needs and budget.