The department, upon written request, shall cause to be manufactured, painted, and printed, and shall furnish to any county legislative authority or the governing body of any incorporated city or town, directional signboards, guide boards, and posts of the uniform state standard of color, shape, and design for the erection and maintenance thereof by the county legislative authority or the governing body of any incorporated city or town upon the roads and streets within their respective jurisdictions. The directional signboards, guide boards, and posts shall be manufactured and furnished, as aforesaid, pursuant to written request showing the number of signs desired and the directional or guide information to be printed thereon. The department shall fix a charge for each signboard, guide board, and post manufactured and furnished as aforesaid, based upon the ultimate cost of the operations to the department, and the county legislative authority, from the county road fund, and the governing body of any incorporated city or town, from the street fund, shall pay the charges so fixed for all signboards, guide boards, and posts so received from the department.