All contracts that the Authority may let for professional services, nonprofessional services, or goods, materials, and equipment shall be subject to the Virginia Public Procurement Act (§ 2.2-4300 et seq.). Nothing herein will be construed to prevent the Authority from adopting a small purchases policy in keeping with such Act. If the Authority is procuring pursuant to a federal grant or program that requires compliance with federal procurement law, then the Authority may procure in compliance with federal law. If the Authority in the exercise of its powers is procuring in another state for use in that state, the Authority may procure in compliance with that state’s procurement law.