(a) Amount. Any individual procurement of supplies or services not exceeding $100,000 and any procurement of construction not exceeding $100,000, or any individual procurement of professional or artistic services not exceeding $100,000 may be made without competitive source selection. Procurements shall not be artificially divided so as to constitute a small purchase under this Section. Any procurement of construction not exceeding $100,000 may be made by an alternative competitive source selection. The construction agency shall establish rules for an alternative competitive source selection process. This Section does not apply to construction-related professional services contracts awarded in accordance with the provisions of the Architectural, Engineering, and Land Surveying Qualifications Based Selection Act.
     (b) Adjustment. Each July 1, the small purchase maximum established in subsection (a) shall be adjusted for inflation as determined by the Consumer Price Index for All Urban Consumers as determined by the United States Department of Labor and rounded to the nearest $100.
     (c) Based upon rules proposed by the Board and rules promulgated by the chief procurement officers, the small purchase maximum established in subsection (a) may be modified.
     (d) Certification. All small purchases with an annual value that exceeds $50,000 shall be accompanied by Standard Illinois Certifications in a form prescribed by each Chief Procurement Officer.