Option 1 Predominant Aspect Rule
(You Can't Get One Without The Other)
If your main purpose is to contract for a service, with incidental goods materializing as a result of the service, then treat it as a service contract. If your main purpose is to acquire a good, with incidental service needed to get the good up and going, then treat it as a purchase contract.
Option 2 Separating the Components
(Splitting the Difference )
Separate the tangible and service components and negotiate the service contract while complying with bidding requirements for the tangible component.