The cost of a cease and desist letter will depend on whether you want to attempt to write the letter yourself, or if you want the assistance of a legal professional. The cost of an attorney can vary depending on the typical rates in your location, as well as on the individual’s specialty and years of experience. The cost will most likely increase significantly if the issue escalates beyond just a cease and desist letter and requires that the attorney file and manage a lawsuit and appear on your behalf in court.