Del. Code tit. 17, § 151

The Department shall not purchase any materials, equipment or supplies, nor enter into any contract for the performance of any work except in accordance with Chapter 69 of Title 29, except that said Chapter 69 of Title 29 shall not apply, when in the best interests of the State, as determined by the Secretary and approved by the Budget Commission, the Department enters into agreements with other states, counties, municipalities, other governmental agencies or private entities to have such work or services supplied pursuant to contracts entered into by such other public authorities or private entities.