Tennessee Code Title 6. Cities and Towns § 6-56-304

(1) Purchases costing less than two thousand five hundred dollars ($2,500); provided, that this exemption shall not apply to purchases of like items that individually cost less than two thousand five hundred dollars ($2,500), but that are customarily purchased in lots of two (2) or more, if the total purchase price of such items would exceed two thousand five hundred dollars ($2,500) during any fiscal year;

(2) Any goods or services that may not be procured by competitive means because of the existence of a single source of supply or because of a proprietary product. A record of all such sole source or proprietary purchases shall be made by the person or body authorizing such purchases and shall specify the amount paid, the items purchased, and from whom the purchase was made. A report of such sole source or proprietary purchases shall be made as soon as possible to the municipal governing body and the chief executive officer of the municipality and shall include all items of information as required for the record;

(3) Purchases or leases of any supplies, materials or equipment for immediate delivery in actual emergencies arising from unforeseen causes, including delays by contractors, delays in transportation, and unanticipated volume of work. A record of any such emergency purchase shall be made by the person or body authorizing such emergency purchases, and shall specify the amount paid, the items purchased, from whom the purchase was made and the nature of the emergency. A report of any emergency purchase shall be made as soon as possible to the municipal governing body and the chief executive officer of the municipality, and shall include all items of information as required in the record;

(4) Leases or lease-purchase agreements requiring total payments of less than two thousand five hundred dollars ($2,500) in each fiscal year the agreement is in effect; provided, that this exemption shall not apply to leases of like or related items that individually may be leased or lease-purchased with total payments of less than two thousand five hundred dollars ($2,500) in any fiscal year, but that are customarily leased or lease-purchased in numbers of two (2) or more, if the total lease or lease-purchase payments for such items under a single agreement would be two thousand five hundred dollars ($2,500) or more in any fiscal year;

(5) Purchases, leases, or lease-purchases of real property;

(6) Purchases, leases, or lease-purchases from any federal, state, or local governmental unit or agency of secondhand articles or equipment or other materials, supplies, commodities, and equipment;

(7) Purchases of perishable commodities, when such items are purchased in the open market. A record of all such purchases shall be made by the person or body authorizing such purchases and shall specify the amount paid, the items purchased, and from whom the purchase was made. A report of such purchases shall be made, at least monthly, to the chief executive officer and the governing body, and shall include all items of information as required in the record. Fuel and fuel products may be purchased in the open market without public advertisement, but shall, whenever possible, be based on at least three (3) competitive bids. Fuel and fuel products may be purchased from the department of general services' contract where available; and

(8) Purchases, for resale, of natural gas and propane gas.