Large billboards typically cost around $2000 for a specified period of time. If placed in a high traffic area, billboards can be highly effective. Many real estate agents use billboards to generate business for the agency. Experts recommend using billboard in real estate if the agent will be selling an entire subdivision. This will help the agent gain maximum exposure and generate more revenue. Since billboards are not cost-effective, it is best to only use billboards when there is a potential for a larger market.