Legislative members of the Commission shall receive such compensation as provided in § 30-19.12, and nonlegislative citizen members shall receive such compensation as provided in § 2.2-2813 for the performance of their duties. All members shall be reimbursed for reasonable and necessary expenses incurred in the performance of their duties as provided in §§ 2.2-2813 and 2.2-2825. However, all such compensation and expenses shall be paid from existing appropriations to the Commission.