50 ILCS 510/8
A political subdivision may waive the requirements of Sections 4, 5, and 6 if it determines, by resolution, that an emergency situation exists and a firm must be selected in an expeditious manner, or the cost of architectural, engineering, and land surveying services for the project is expected to be less than $40,000 . This amount shall be increased annually by a percentage equal to the annual unadjusted percentage increase, if any, as determined by the consumer price index-u.
For purposes of this Section, "consumer price index-u" means the index published by the Bureau of Labor Statistics of the United States Department of Labor that measures the average change in prices of goods and services purchased by all urban consumers, United States city average, all items, 1982-84=100.
50 ILCS 510/8