1. The City Council shall contract for and purchase, or issue purchase authorization for, all supplies, materials and equipment for the operation of the municipal government. Before the purchase of, or contract for, any supplies, materials or equipment, or the sale of any surplus or obsolete supplies, materials or equipment, ample opportunity for competitive bidding, under such regulations and with such exceptions as said City Council may prescribe, shall be given.
2. CONTRACTUAL SERVICES for the purpose of this chapter, shall mean services performed for the city by persons not in the employ of the city and may include the use of equipment or the furnishing of commodities in connection with such services under express or implied contract. CONTRACTUAL SERVICES shall include travel, freight, express, parcel post, postage, telephone, telegraph, utilities, rents, printing and binding, repairs, alterations and maintenance of buildings, equipment, streets, bridges and other physical facilities of the city.
3. Subject to the provisions of state law and this section, surplus or obsolete supplies, materials or equipment belonging to the city may be sold by the City Council.
4. No sale shall be made under this section until the City Council has declared the supplies, materials or equipment involved to be surplus or obsolete.
5. Except as may otherwise be provided, the City Council shall advertise any sale under this section in a newspaper of general circulation in the city or county, or in such other manner as deemed necessary to adequately reach prospective buyers to give them an opportunity to make bids. All bids shall be sealed and opened in public at a designated time and place, except when the sale is by auction. The City Council may repeatedly reject all bids and advertise again. The City Council shall sell such supplies, materials and equipment to the highest responsible bidder and, if necessary, shall cast lots in case of a tie to determine to whom to sell.
6. The Mayor, subject to any regulations which the City Council may prescribe, shall contract for and purchase, or issue purchase authorization for, all supplies, materials and equipment for the offices, departments and agencies of the municipal government. Every such contract or purchase exceeding $7,500, shall require the prior approval of the City Council. The Mayor may also transfer to or between offices, departments and agencies, or sell, surplus or obsolete supplies, materials and equipment, subject to such regulations as the City Council may prescribe.