Amends the Civil Administrative Code of Illinois. Provides that a State agency shall accept cash when offered as payment for any transaction totaling $500 or less. Prohibits a State agency from charging a higher price or adding any additional fee if a transaction conducted in cash. Amends the Local Governmental Acceptance of Credit Cards Act. Changes the name of the Act to the Local Governmental Acceptance of Credit Cards and Cash Act. Provides that a unit of local government shall accept cash when offered as payment for any transaction totaling $500 or less. Prohibits a unit of local government from charging a higher price or adding any additional fee if a transaction conducted in cash. Amends the Consumer Fraud and Deceptive Business Practices Act. Provides that any person engaged in the business of selling or offering to sell goods or services at retail to the public with an individual accepting in-person payments at a physical location shall not: (1) refuse to accept cash as a form of payment for sales of less than $500 made at the physical location; (2) post a sign on the premises stating that cash payment is not accepted; or (3) charge a higher price to customers paying with cash compared to the price charged to customers not paying with cash. Sets forth exceptions to the provision. Provides that a violation of the provision is an unlawful practice within the meaning of the Act.