7-3-1307. Division of purchases and supplies. There is in the department of finance a division of purchases and supplies. The head of the division is a purchasing agent. The purchasing agent shall make all purchases for the municipality in the manner and with the exceptions that may be provided by ordinance and shall, under regulations that may be provided by ordinance, sell all property, real and personal, of the municipality not needed for public use or that may have become unsuitable for use. The purchasing agent has charge of the storerooms and warehouses of the municipality that the commission may by ordinance provide.