The boards of supervisors of the several counties are authorized to allow compensation of the officers rendering services in matters of registration and elections, to provide ballot boxes, voter rolls as electronically maintained by the Statewide Elections Management System, and all other things required by law in registration and elections. The boards are also authorized, by order spread upon the minutes of the board setting forth the cost and source of funds therefor, to allow such reasonable sum as may be expended in supplying voting compartments, tables or shelves for use at elections.