An authority, a cooperative district of which the authority is a member, and any private user, and all contracts made by them are exempt from the laws of the State of Alabama requiring competitive bids for any contract to be entered into by municipalities or public corporations authorized by them or any public works, including, but without limitation to, Article 3, commencing with Section 41-16-50, of Chapter 16 of Title 41, as amended from time to time, and Chapter 2 of Title 39, as amended from time to time.