Be aware that some of these sample letters have legal, financial, or other implications. If you are not sure about the use of any letter, consult with an appropriate professional first ART WORK FOR BILLBOARD DESIGN: Includes conceptual layouts, comprehensive layout, artist s renderings, preparation of camera - ready mechanicals. Estimated cost $ (Typography costs are extra) This commitment form is to serve as Client s written authorization for (firm) to perform services and/or contract with suppliers for the above described items or services (radio, television, magazine, publication, outdoor advertising, artwork, production, etc.) on client s behalf. Client s signature also indicates understanding of estimates, prices, terms and liability to (firm) for said items or services. Alterations or.