5. Process for conducting state procurements. The process for conducting state procurements for services and commodities shall be as follows:
Determination of need. State agencies shall be responsible for determining the need for a given service or commodity:
(i) For commodities, upon such determination of need, state agencies shall ascertain whether the commodity is available in the form, function and utility consistent with their needs from preferred sources and if so, shall purchase said commodity from a preferred source in accordance with the provisions of this article. If not so available, state agencies shall determine whether the commodity is available in the form, function and utility consistent with their needs on a centralized contract and if so, except as provided in subparagraph (v) of paragraph a of subdivision three of this section, shall purchase said commodity using the centralized contract. If a commodity is not available in the form, function and utility consistent with the needs of the state agency from a preferred source or a centralized contract or as provided for in subparagraph (v) of paragraph a of subdivision three of this section, the state agency may procure the commodity independently or in conjunction with another state agency in accordance with paragraph c of subdivision three of this section.
(ii) For services, upon such determination of need, state agencies shall ascertain whether the service is available in the form, function and utility consistent with their needs from preferred sources and, if so, shall purchase said service through the preferred source in accordance with the provisions of this article. If not so available, state agencies the heads of which are appointed by the governor:
(A) Shall purchase the service if it is available in the form, function and utility consistent with their needs using an established centralized contract procured by either the office of general services or another state agency;
(B) May request that the office of general services procure such a service, particularly with respect to those services having utility and/or benefit to more than one state agency; or
(C) May procure the service independently or in conjunction with another state agency.