The following may be purchased without giving an opportunity for competitive bidding:
   A.   Supplies, materials, equipment or contractual services whose cost does not exceed twenty five thousand dollars ($25,000.00) in a single transaction; (Ord. 1993-01, 2-2-1993; amd. Ord. 2002-01, 2-5-2002)
   B.   Supplies, materials, equipment or contractual services which can be furnished only by a single dealer, or which have a uniform price wherever bought;
   C.   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;
   D.   Equipment to replace existing equipment which has become inoperable when the council declares the purchase an emergency;
   E.   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;
   F.   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
   G.   Contractual services of a professional nature, such as engineering, architectural and medical services unless competitive bidding is required by applicable law or regulation. (1985 Code § 7-107)