Ala. Code § 45-48-142

In order that the several volunteer fire departments throughout Marshall County may be able to purchase their supplies and equipment at more competitive prices, there is hereby created and established within the Marshall County Association of Volunteer Firemen, a centralized purchasing system to be administered according to rules and procedures adopted, from time to time, by resolution spread upon the minutes of such association. Participation in the centralized purchasing system authorized by this section shall be optional at the discretion of each volunteer fire department belonging to such association.