The cost of a radio promoter can vary depending on several factors, such as the level of experience, reputation, and the specific services offered. Fees can range from a few hundred dollars to several thousand dollars, depending on the scope and duration of the promotional campaign. Some radio promoters may charge a flat fee, while others work on a percentage basis, taking a percentage of any resulting revenue or royalties. It is important to research and discuss pricing with potential radio promoters to understand their specific rates and services before making any commitments.