18-7-202. Lower rates permissible. The prices, rates, and standards herein fixed and prescribed are in each instance and for every case covered by this part the maximum prices, rates, and standards. Their prescription and establishment herein shall in no case be taken as prohibiting a lesser or lower rate or price than herein fixed. Every department, institution, officer, or agent of the state shall, whenever possible, obtain a lower rate or price than is fixed herein, the equivalent of the minimum rate mentioned in 18-7-204.