Purchases of items regularly used in connection with school operation shall not be made in small quantities for the purpose of circumventing the law requiring competitive bids or quotations, but shall be purchased by contract whenever feasible. School boards shall have the authority, however, to award such contracts for supplies or equipment to be delivered to different points in the school district or county, to different bidders, when the best interests of the district or county warrant such action. Reasons for awarding such contracts to different bidders for different areas in the district shall be recorded on the minutes of the school board. In no event shall the price paid exceed the lowest and best bid received.