Tennessee Code Title 6. Cities and Towns § 6-56-306

(a) Municipal governing bodies are specifically authorized to lower the dollar amounts required in this part for public advertisement and competitive bidding to an amount to be set by the municipal governing body. Municipal governing bodies may by ordinance increase the dollar amount required in this part for public advertisement and competitive bidding from two thousand five hundred dollars ($2,500) to a maximum of ten thousand dollars ($10,000). Municipal governing bodies of any municipality having a population of not less than forty thousand (40,000) nor more than forty-two thousand five hundred (42,500) or any municipality with a population over one hundred fifty thousand (150,000), according to the 2000 federal census or any subsequent federal census, may increase the dollar amount required in this part for public advertisement and competitive bidding to a maximum not to exceed twenty-five thousand dollars ($25,000); provided, that purchases of between ten thousand dollars ($10,000) and twenty-five thousand dollars ($25,000) shall, wherever possible, be based upon at least three (3) competitive bids. When the governing body does this, references in this part to two thousand five hundred dollars ($2,500) shall be deemed a reference to the amount established by the municipal governing body in its ordinance.

(b) Municipal governing bodies are specifically authorized to adopt regulations providing procedures for implementing this part.