Ariz. Rev. Stat. § 41-2632
A. Any public procurement unit may either participate in, sponsor, conduct or administer a cooperative purchasing agreement to procure any materials, services, professional services, construction or construction services with one or more public procurement units or external procurement activities in accordance with an agreement entered into between the participants. The cooperative purchasing may include joint or multiparty contracts between public procurement units and open-ended public procurement unit contracts that are available to local public procurement units. A nonprofit corporation may enter into an agreement pursuant to this section if one or more of the parties involved is a public procurement unit. An agreement entered into as provided in this article is exempt from section 11-952, subsection D. Parties under a cooperative purchasing agreement may:
H. For the purposes of this section: