The members shall serve without compensation, but shall receive reimbursement for actual and necessary expenses incurred in connection with the performance of their duties. However, in lieu of this reimbursement for attendance at commission or committee meetings, each member of the commission may receive a per diem of one hundred dollars ($100), but not to exceed a combined total of five meetings in any one calendar month, plus the necessary traveling expenses as may be authorized by the commission. The commission shall pay all costs pursuant to this section.