(1)    Every agency other than the board of regents of the University of Wisconsin System, the University of Wisconsin-Madison, or an agency making purchases under s. 16.74 shall make all purchases of materials, supplies, equipment, and contractual services relating to information technology or telecommunications from the department, unless the department requires the agency to purchase the materials, supplies, equipment, or contractual services pursuant to a master contract established under s. 16.972 (2) (h), or grants written authorization to the agency to procure the materials, supplies, equipment, or contractual services under s. 16.75 (1) or (2m), to purchase the materials, supplies, equipment, or contractual services from another agency or to provide the materials, supplies, equipment, or contractual services to itself. The board of regents of the University of Wisconsin System and the University of Wisconsin-Madison may make purchases of materials, supplies, equipment, and contractual services relating to information technology or telecommunications from the department.

   (2)   Sections 16.705 to 16.767 and 16.77 (1) do not apply to the purchase of materials, supplies, equipment, or contractual services by any agency from the department under sub. (1).