Replaces everything after the enacting clause. Amends the Retailers' Occupation Tax Act. Provides that the Department of Revenue may (instead of shall) require applicants for a certificate of registration to furnish a bond or other security. Sets forth certain criteria that may be considered by the Department when determining whether to require a bond or other security. Amends the Transient Merchant Act of 1987 to make conforming changes. Effective immediately.