Section 106-A. Service charge for receiving, handling and disbursing funds and coupons

The fiscal officer of the political  subdivision  or  of  a  district  therein  shall impose upon each contractor such service charge
  for receiving, handling and disbursing funds  and  coupons  pursuant  to
  section  one  hundred six of this article as the local governing body of
  the political subdivision may provide by local law  or  ordinance.  Such
  service  charge  shall not exceed a reasonable amount which is generally
  consistent with charges by a bank or trust company for such  a  service.
  This  section  shall not apply where a political subdivision or district
  therein has entered into an agreement  with  a  bank  or  trust  company
  pursuant to section one hundred six of this article.