TENN. CODE ANN. §12-3-1205. Cooperative purchasing agreements.
(b) (1) Notwithstanding any other law to the contrary, any municipality county, utility district, or other local government of the state may participate in, sponsor, conduct, or administer a cooperative purchasing agreement for the procurement of any goods, supplies, services, or equipment with one (1) or more other governmental entities outside this state, to the extent the laws of the other state permit the joint exercise of purchasing authority, in accordance with an agreement entered into between or among the participants; provided, such goods, supplies, services, or equipment were procured in a manner that constitutes competitive bidding and were advertised, evaluated, and awarded by a governmental entity and made available for use by other governmental entities.
(2) A municipality, county, utility district, or other local government of the state may participate in a master agreement by adopting a resolution accepting the terms of the master agreement. If a participant in a joint or multi-party agreement is required to advertise and receive bids, then it will be deemed sufficient for those purposes that the purchasing entity or the entity that procured the bid complied with its own purchasing requirements. The participant shall acquire and maintain documentation that the purchasing entity or entities that procured the bid complied with its own purchasing requirements.
(3) The powers conferred by this section are in addition and supplemental to the powers conferred by any other law, and any limitations imposed by this section shall not affect powers conferred by any other law.
(4) This subsection (b) shall not apply to:
(A) Purchases of new or unused motor vehicles, unless the motor vehicles are manufactured for a special purpose as defined in § 12–3–1012; or
(B) Purchases of construction, engineering or architectural services, or construction materials.