All costs, charges and expenses incurred by the county clerk, county board, commissioner, superintendent, or any other officer or official of a county in carrying out the provisions of this title and the salaries of the members of the county board, commissioner, superintendent, salaries and compensation for extra service of the clerk and other employees of the county board and the compensation of the members of the district boards, except as herein otherwise provided, shall be paid by the county upon certification by the county clerk, county board, commissioner, superintendent or other county officer or official; but the board of chosen freeholders of any county, to facilitate the prompt payment of the compensation of members of district boards and the rental of polling places, is authorized to pay to the several municipal clerks in the county one payment for the gross amount due for such compensation and rentals in the municipality and direct the municipal clerks to pay the individual amounts due the members of the district boards and the lessors of the polling places in the municipality upon the proper certification of the county board. Where any municipality may provide voting machines there shall be paid by the county to such municipality the difference between the costs, charges and expenses incurred and the costs, charges and expenses which would have been incurred had such voting machines not been provided by such municipality, including the saving in rental of polling places and in compensation paid to members of district boards resulting from consolidation of or reduction in number of election districts, and including the saving resulting from the payment of a lesser rate of compensation to members of district boards where such machines are provided by the municipality.