Subject to the limitations of this section or other applicable law, any type of contract which will promote the best interests of the city may be used; provided, that a cost-plus-a-percentage-of-cost contract is prohibited. A cost-reimbursement contract may be used only when a determination is made in writing by the city manager, purchasing agent, the department buyer, or the department head, that such contract is likely to be less costly to the city than any other type, or that it is impracticable to obtain the supplies, services, or construction required except under such contract. [Ord. 06-18-2013A § 2].