Haw. Rev. Stat. § 325-138: Available choices.

The department shall purchase immunizations through the federal Centers for Disease Control and Prevention contracted price list, or other group purchasing negotiated discount rate, for which costs are funded pursuant to this part. The department may make purchases from available immunizations based on health care provider requests and shall not limit the immunizations the department purchases from those available at a discounted rate; provided that the department may choose to not purchase a specific immunization that has a low volume of statewide health care provider requests.