A. The following may be purchased without giving an opportunity for competitive bidding:
1. Supplies, materials, equipment or contractual services whose cost does not exceed five thousand dollars ($5,000.00) in a single transaction;
2. Supplies, materials, equipment or contractual services which can be furnished only by a single dealer, or which have a uniform price wherever bought;
3. Supplies, materials, equipment or contractual services purchased from another unit of government at a price deemed below that obtainable from private dealers, including government surplus;
4. Equipment to replace existing equipment which has become inoperable when the council declares the purchase an emergency;
5. Contractual services, including, but not limited to, natural gas, electricity, telephone service, purchased from a public utility at a price or rate determined by the state corporation commission or other governmental authority;
6. Supplies, materials, equipment or contractual services when purchased at a price not exceeding a price set therefor by the state purchasing agency or any other state agency hereafter authorized to regulate prices for things purchased by the state, whether such price is determined by a contract negotiated with a vendor or otherwise; and
7. Contractual services of a professional nature, including, but not limited to, engineering, architectural or medical services, unless competitive bidding is required by applicable law or regulations, such as certain federal grants programs. (1984 Code)