(A) The early involvement of purchasing services in the initial stages of a contemplated major purchase, defined as having an estimated value above the bid threshold, is required. When a major purchase is under consideration, the purchaser shall provide purchasing services the basic requirements and potential vendors and sources. Purchasing services staff shall research state contracts or cooperative purchasing organization agreements vendors and suggest the use of any such available contracts. The purchasing agent shall work with the purchaser to further define needs and develop an evaluation process. With input from purchasing services, the purchaser shall determine whether the acquisition will be made utilizing an existing contract or whether a formal solicitation must be initiated.